Operation of an industrial electron accelerator in a double-beam e,X-mode
Analysis of mixed e,X-radiation formation in output devices of an industrial electron accelerator is conducted. The possibility is demonstrated to obtain an extra radiation channel on the basis of a practically free source of Xrays simultaneously with the main channel of product processing with elec...
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| Zitieren: | Operation of an industrial electron accelerator in a double-beam e,X-mode / V.A. Shevchenko, A.Eh. Tenishev, V.L. Uvarov, A.A. Zakharchenko // Problems of atomic science and technology. — 2019. — № 6. — С. 163-167. — Бібліогр.: 4 назв. — англ. |
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irk-123456789-1954822023-12-05T13:25:24Z Operation of an industrial electron accelerator in a double-beam e,X-mode Shevchenko, V.A. Tenishev, A.Eh. Uvarov, V.L. Zakharchenko, A.A. Application of accelerators in radiation technologies Analysis of mixed e,X-radiation formation in output devices of an industrial electron accelerator is conducted. The possibility is demonstrated to obtain an extra radiation channel on the basis of a practically free source of Xrays simultaneously with the main channel of product processing with electron beam. The conditions of production of the secondary radiation in the state of electronic equilibrium at product treatment with scanning electron beam in the main radiation channel are studied by means of computer simulation. The dependence of spatial radiant characteristics of the X-ray radiation on the spectrum of a primary electron beam and surface density of a treated load has been established. For an industrial accelerator LU-10 of NSC KIPT, the regime of object processing in the extra radiation channel is examined. The results of calculation of the X-ray dose rate and its spatial distribution are in good agreement with the experimental data. The comparative capacity of both radiation channels of the plant is analyzed. The extra radiation source can be used for the execution of non-commercial programs like sanitation of cultural artefacts. Проведено аналіз умов формування змішаного е,Х-випромінювання у вихідних пристроях промислового прискорювача електронів. Показана можливість отримання одночасно з основним каналом опромінювання продукції пучком електронів додаткового радіаційного каналу на основі практично безкоштовного джерела гальмівних фотонів. Методом комп'ютерного моделювання вивчені умови отримання вторинного випромінювання в стані електронної рівноваги при проведенні обробки продукції скануючим пучком електронів в основному радіаційному каналі. Отримана залежність просторово-енергетичних характеристик гальмівного випромінювання від спектра первинного пучка електронів і поверхневої щільності оброблюваного ним вантажу. Для промислового прискорювача ЛУ-10 ННЦ ХФТІ досліджені умови обробки об'єктів у додатковому радіаційному каналі. Результати розрахунку потужності дози гальмівного випромінювання та її просторового розподілу задовільно узгоджуються із зміряними в експерименті. Отримані дані з порівняльної продуктивності установки в обох радіаційних каналах. Додаткове джерело випромінювання може бути використане для проведення некомерційних програм (наприклад, санітарної обробки об'єктів культурної спадщини). Проведен анализ условий формирования смешанного е,Х-излучения в выходных устройствах промышленного ускорителя электронов. Показана возможность получения одновременно с основным каналом облучения продукции пучком электронов дополнительного радиационного канала на основе практически бесплатного источника тормозных фотонов. Методом компьютерного моделирования изучены условия получения вторичного излучения в состоянии электронного равновесия при проведении обработки продукции сканирующим пучком электронов в основном радиационном канале. Получена зависимость пространственноэнергетических характеристик тормозного излучения от спектра первичного пучка электронов и поверхностной плотности обрабатываемого им груза. Для промышленного ускорителя ЛУ-10 ННЦ ХФТИ исследованы условия обработки объектов в дополнительном радиационном канале. Результаты расчета мощности дозы тормозного излучения и ее пространственного распределения удовлетворительно согласуются с измеренными в эксперименте. Получены данные по сравнительной производительности установки в обоих радиационных каналах. Дополнительный источник излучения может быть использован для проведения некоммерческих программ (например, санитарной обработки объектов культурного наследия). 2019 Article Operation of an industrial electron accelerator in a double-beam e,X-mode / V.A. Shevchenko, A.Eh. Tenishev, V.L. Uvarov, A.A. Zakharchenko // Problems of atomic science and technology. — 2019. — № 6. — С. 163-167. — Бібліогр.: 4 назв. — англ. 1562-6016 PACS: 87.56.bd; 41.50.+h; 81.40.Wx; 87.53Bn http://dspace.nbuv.gov.ua/handle/123456789/195482 en Вопросы атомной науки и техники Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| institution |
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Application of accelerators in radiation technologies Application of accelerators in radiation technologies |
| spellingShingle |
Application of accelerators in radiation technologies Application of accelerators in radiation technologies Shevchenko, V.A. Tenishev, A.Eh. Uvarov, V.L. Zakharchenko, A.A. Operation of an industrial electron accelerator in a double-beam e,X-mode Вопросы атомной науки и техники |
| description |
Analysis of mixed e,X-radiation formation in output devices of an industrial electron accelerator is conducted. The possibility is demonstrated to obtain an extra radiation channel on the basis of a practically free source of Xrays simultaneously with the main channel of product processing with electron beam. The conditions of production of the secondary radiation in the state of electronic equilibrium at product treatment with scanning electron beam in the main radiation channel are studied by means of computer simulation. The dependence of spatial radiant characteristics of the X-ray radiation on the spectrum of a primary electron beam and surface density of a treated load has been established. For an industrial accelerator LU-10 of NSC KIPT, the regime of object processing in the extra radiation channel is examined. The results of calculation of the X-ray dose rate and its spatial distribution are in good agreement with the experimental data. The comparative capacity of both radiation channels of the plant is analyzed. The extra radiation source can be used for the execution of non-commercial programs like sanitation of cultural artefacts. |
| format |
Article |
| author |
Shevchenko, V.A. Tenishev, A.Eh. Uvarov, V.L. Zakharchenko, A.A. |
| author_facet |
Shevchenko, V.A. Tenishev, A.Eh. Uvarov, V.L. Zakharchenko, A.A. |
| author_sort |
Shevchenko, V.A. |
| title |
Operation of an industrial electron accelerator in a double-beam e,X-mode |
| title_short |
Operation of an industrial electron accelerator in a double-beam e,X-mode |
| title_full |
Operation of an industrial electron accelerator in a double-beam e,X-mode |
| title_fullStr |
Operation of an industrial electron accelerator in a double-beam e,X-mode |
| title_full_unstemmed |
Operation of an industrial electron accelerator in a double-beam e,X-mode |
| title_sort |
operation of an industrial electron accelerator in a double-beam e,x-mode |
| publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| publishDate |
2019 |
| topic_facet |
Application of accelerators in radiation technologies |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/195482 |
| citation_txt |
Operation of an industrial electron accelerator in a double-beam e,X-mode / V.A. Shevchenko, A.Eh. Tenishev, V.L. Uvarov, A.A. Zakharchenko // Problems of atomic science and technology. — 2019. — № 6. — С. 163-167. — Бібліогр.: 4 назв. — англ. |
| series |
Вопросы атомной науки и техники |
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2025-07-16T23:28:52Z |
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| fulltext |
ISSN 1562-6016. ВАНТ. 2019. №6(124) 163
APPLICATION OF ACCELERATORS IN RADIATION TECHNOLOGIES
OPERATION OF AN INDUSTRIAL ELECTRON ACCELERATOR
IN A DOUBLE-BEAM e,X-MODE
V.A. Shevchenko, A.Eh. Tenishev, V.L. Uvarov, A.A. Zakharchenko
National Science Center “Kharkov Institute of Physics and Technology”, Kharkiv, Ukraine
E-mail: uvarov@kipt.kharkov.ua
Analysis of mixed e,X-radiation formation in output devices of an industrial electron accelerator is conducted.
The possibility is demonstrated to obtain an extra radiation channel on the basis of a practically free source of X-
rays simultaneously with the main channel of product processing with electron beam. The conditions of production
of the secondary radiation in the state of electronic equilibrium at product treatment with scanning electron beam in
the main radiation channel are studied by means of computer simulation. The dependence of spatial radiant charac-
teristics of the X-ray radiation on the spectrum of a primary electron beam and surface density of a treated load has
been established. For an industrial accelerator LU-10 of NSC KIPT, the regime of object processing in the extra
radiation channel is examined. The results of calculation of the X-ray dose rate and its spatial distribution are in
good agreement with the experimental data. The comparative capacity of both radiation channels of the plant is ana-
lyzed. The extra radiation source can be used for the execution of non-commercial programs like sanitation of cul-
tural artefacts.
PACS: 87.56.bd; 41.50.+h; 81.40.Wx; 87.53Bn
INTRODUCTION
In the work [1], a concept of e,X-installation provid-
ing the possibility to use simultaneously with the prod-
uct processing with scanned electron beam also the X-
ray radiation, accompanying this process, was stated,
and a method for analysis of the path of secondary radi-
ation formation was proposed. Such an approach ena-
bles to obtain a practically free extra source of the
bremsstrahlung photons, particularly, for the sanitation
of cultural artefacts (see, e.g. [2]). In the current work,
the characteristics of the e,X-plant created in NSC KIPT
on the basis of an industrial electron accelerator LU-10
are studied.
1. FORMATION OF e,X-RADIATION
It is convenient to describe the process of the elec-
tron radiation transformation into X-ray beam in various
materials with wide range of their atomic number
Z=7…73 and electron energy Е0=5…100 MeV in an
unified form [3]. According to such an approach, the
thickness of every element of the path of the secondary
radiation formation along its axis is expressed in the
units of range of the electrons with energy Е0 in the ma-
terial of that element (the stopping thickness unit or stu).
For the description of state of the mixed e,X-radiation
along its path, two parameters are introduced: the ener-
gy conversion coefficient of electron radiation into
bremsstrahlung photons, Ех/Еb, where Ех is the total
energy of X-rays intercepting a specified plane, normal
to the radiation axis, Еb is the electron beam energy at
an accelerator output, and also the factor of the second-
ary radiation, Ех/Ее, where Ее is the total energy of elec-
trons intercepting that plane. So it was established, that
in all cases the maximum of the conversion coefficient
is reached at a depth of ~0.5 stu. At further increasing of
stopping length, the gradual attenuation of the photon
flux takes place as a result of absorption. Maximization
of the factor at a depth of ~1.2 stu corresponds to the
onset of electronic equilibrium.
In case of a multicomponent exit device comprising
the layers of different materials normal to the radiation
axis, the stopping length of the path of the e,X-radiation
formation ( from the accelerator exit window to a plane
of interest) can be represented in the form
0 0/ ( , ) ,i i
i
S s r E Z= ∑ (1)
where is is the thickness of i-layer, 0 0( , )ir E Z is the elec-
tron range in its material having the atomic number Zi.
2. LU-10 е,Х-PLANT
2.1. An industrial radiation installation LU-10 com-
prises a one-section electron linac with horizontal beam-
line (Fig. 1). The accelerator is provided with a beam
scanning device S at its exit. The magnitude and form of
the beam sweep are controlled with PC. These parame-
ters are set up taking into account the height of an irra-
diated object and a specified distribution of density of
the beam current on its surface.
SM
S C
e_Ob
X-Ob
e,X
H
e-
e-
X-Ray
I II III
Fig. 1. Output devices of LU-10 accelerator
A conveyor C with the hook-up containers for
placement of the processed load e_Ob is located at a
distance of 92 cm from a scanner horn H. Every con-
tainer has the length L=108 cm The containers are dis-
tributed along the conveyor with intervals ΔL=12 cm.
Behind the conveyor, a wide-aperture stack-monitor SM
[4] for on-line diagnostics of electron energy and ab-
sorbed dose is accommodated at a distance of 223 cm
from the scanner horn. SM comprises a set of 10 plates
mailto:uvarov@kipt.kharkov.ua
ISSN 1562-6016. ВАНТ. 2019. №6(124) 164
from aluminum measured 122×75 cm (H×W). The first
and ultimate plates have the thickness of 5 mm, when
the 8 intermediates are 2 mm thick. The gaps between
the plates are of 15 mm. The stopping length of SM
makes 1.2 stu for electrons with energy of up to
10 MeV. So the bremsstrahlung radiation behind the
monitor is in a state of electronic equilibrium at any
surface density of the irradiated load (including its ab-
sence).
Consequently, the path of radiation formation in the
LU-10 plant can be subdivided into the three areas. The
first corresponds to an arbitrary pure electron beam and
comprises the area between the output window of the
accelerator and the front surface of the main loud
(e_Ob) processed with the electron radiation. The for-
mation of a mixed e,X-radiation takes place at a second
area having stopping length of ~1.2 stu. This process is
completed at its rear border by reaching of condition of
the electronic equilibrium. As a result, an arbitrary pure
flux of X-rays, which can be used for irradiation of an
additional object (X_Ob) is provided in the last third
part of the radiation path.
2.2. The flux incident on the stack-monitor includes
in its lower and top parts the electrons of the primary
beam, when in its central part the flux of mixed e,X-
radiation, generated at interaction of electron beam with
the load, takes place. Consequently, the particle distri-
bution on the surface of the stack-monitor creates a ra-
diation shadow. The ratio of intensities of the electron
and photon components in it is determined by the sur-
face density of the object, and also by energy spectrum
of the beam. In particular, at scanning of a wide-
spectrum beam, the high-energy electrons are deviated
to a lesser angle and so provide the growth of intensity
of the bremsstrahlung radiation from e_Ob, and also an
increase of the dose rate in the central part of X_Ob.
Besides, the profile and intensity of the secondary
radiation are variable depending on the position of a
transport container relative to the beam. Thus, when a
clearance between the containers passes the beam scan-
ning zone, practically all accelerated electrons enter
SM. So the dose Dx obtained by X_Ob can be deter-
mined from the expression
0 ,x x x
e Ob
L LD D D
L L L L−
D
= ⋅ +
+ D + D
(2)
where x
e ObD − is the dose obtained by X_Ob at the pres-
ence of e_Ob under the electron beam, 0
xD is the dose
obtained by X_Ob in absence of e_Ob.
3. RESULTS AND DISCUSSION
The conditions of product processing with the scan-
ning electron beam in various regimes of the LU-10
plant were studied by a computer simulation technique
making use a transport code GEANT4. In simulations,
the load was corresponded as a parallelepiped from cel-
lulose measuring 100×35×35 cm3 (X×Y×Z) with sur-
face density ρS=2; 4; 6 g/cm2 respectively. As a target,
irradiated with the secondary X-rays (Х_Ob), a plate
from PMMA with lateral dimensions coincided with
ones of SM and positioned behind it was considered.
The beam spectra with energy in maximum Ееmax= 8 and
10 MeV corresponded those actually measured using a
magnet analyzer (Fig. 2). In a mode with maximum of
10 MeV, the spectra having a high-energy tail (spectrum
2) and without it (spectrum 3) were used.
6 8 10 12 14 16
0,0
0,2
0,4
0,6
0,8
1,0
N
i/
N
m
ax
Ee , MeV
1
2
3
Fig. 2. Beam spectra of LU-10 electron linac
As an example, the results of calculation of the en-
ergy conversion coefficient and the secondary radiation
factor along the axis of the е_Ob+SM+X_Ob system at
an electron energy Ееmax=10 MeV (spectrum 3) and
surface density of е_Ob, ρS=4 g/cm2 are given in Fig. 3.
It is evident, that the irradiation is conducted in the con-
ditions of electronic equilibrium.
0.0 0.5 1.0 1.5 2.52.0
Z,stu
E x
/E
b
�
�
�
�
�
�
�� ��
�
����
a
��
�
�
0.000
0.010
0.015
0.005
0.020
0.030
0.025
0.035
0.040 e_Ob SM X_Ob
a
0.0 0.5 1.0 1.5 2.52.0
0
40
60
20
80
120
100
140
Z,stu
E
x/E
e
� � �� � �
�
�
�
�
�
�
�
�
b
��
�
�
e_Ob SM X_Ob
b
Fig. 3. Distribution of energy conversion coefficient (a)
and secondary radiation factor (b) along the axis
of the output devices of LU-10 installation
The characteristics of flux of the bremsstrahlung
photons at the surface of X_Ob in the presence of the
load e_Ob with various surface density, and also at its
absence for the electron energy in maximum of the
spectrum of 8 and 10 MeV are presented in Fig. 4 and
Table 1.
It is evident, that the photon energy averaged over
the beam spectrum, <EX>, as well as the energy conver-
ISSN 1562-6016. ВАНТ. 2019. №6(124) 165
sion coefficient increase with the growth of energy of
the beam electrons. At the same time, the most probable
photon energy ЕXmax practically keeps its value within
the statistical uncertainty at the increase of surface den-
sity of e_Ob in the actual span of 2…6 g/cm2, when the
conversion coefficient decreases due to the absorption
of part of the photons in e_Ob. At absence of the latter,
the value of the secondary radiation factor ЕХ/Ее falls
sharply.
0,001 0,01 0,1 1 10
0,0
5,0x10-4
1,0x10-3
1,5x10-3
2,0x10-3
2,5x10-3
3,0x10-3
3,5x10-3
N
i/
Σ
N
i
Eγ , MeV
8 MeV
10 MeV
a
0,001 0,01 0,1 1 10
0,0
5,0x10-4
1,0x10-3
1,5x10-3
2,0x10-3
2,5x10-3
N
i /
Σ
N
i
Eγ , MeV
ρ = 4 g/cm2
8 MeV
10 MeV
b
Fig. 4. Spectra of X-rays: without e_Ob (а);
with e_Ob (ρS=4 g/cm2) (b)
Table 1
Characteristics of bremsstrahlung radiation incident
on X_Ob
ρS,
g/cm2
8 MeV 10 MeV
EX/Ee <EX>,
MeV
EX/Eb,
%
EX/Ee <EX>,
MeV
EX/Eb,
%
0 52 0.86 3.56 12 1.00 4.48
2 163 0.95 1.54 150 1.08 2.27
4 217 1.10 1.22 185 1.25 1.73
6 223 1.18 1.13 182 1.35 1.58
In Fig. 5, the distributions are presented of absorbed
dose of the X-ray radiation at the surface of X_Ob,
DX/I, normalized to 1 mA of the average beam current
and 1h of the irradiation time for a monochromatic
beam with energy of 10 MeV acting on e_Ob and hav-
ing ρS=4 g/cm2 – (a), for a beam with actual spectrum
having Eemax=10 MeV without the high-energy part −
(b) and with it – (c), and also for the last version in ab-
sence of e_Ob – (d).
It is seen, that in case of a monochromatic beam (see
Fig. 5,a), the vertical dose distribution has two maxi-
mums at the expense of the radiation shadow created
with e_Ob. Adding the high-energy electrons results at
first in leveling the dose profile (see Fig. 5,b), and then
in the formation of one maximum (see Fig. 5,c,d).
-40
-30
-20
-10
0
10
20
30
40
-60
-40
-20
0
20
40
60
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
Y-axis (cm)
X
/I (kG
y/h/m
A
)
X-axis (cm)
4 g/cm2,
10 MeV, mono
0.9250
1.111
1.296
1.482
1.667
1.853
2.038
2.223
2.409
2.595
2.780
X/I
a
-40
-30
-20
-10
0
10
20
30
40
-60
-40
-20
0
20
40
600.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
Y-axis (c
m)
X
/I (kG
y/h/m
A
)
X-axis (cm)
4 g/cm2,
10 MeV, Nikiforov
0.8700
1.068
1.266
1.464
1.662
1.860
2.058
2.256
2.454
2.652
2.850
X/I
b
-40
-20
0
20
40
-60
-40
-20
0
20
40
60
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
Y-axis (c
m)
X
/I (kG
y/h/m
A
)
X-axis (cm)
4 g/cm2,
10 MeV, 2015
1.000
1.270
1.540
1.810
2.080
2.350
2.620
2.890
3.160
3.430
3.700
X/I
c
-40
-30
-20
-10
0
10
20
30
40
-60
-40
-20
0
20
40
60
0
10
20
30
40
Y-axis (c
m)
X
/I (kG
y/h/m
A
)
X-axis (cm)
1.000
5.600
10.20
14.80
19.40
24.00
28.60
33.20
37.80
42.40
47.00
X/I,
kGy/h/mA
10 MeV, p1
d
Fig. 5. Dose distribution at the surface of X_Ob
ISSN 1562-6016. ВАНТ. 2019. №6(124) 166
In Fig. 6, the normalized depth-dose distributions for
X_Ob at a various maximum electron energy Ееmax and
surface density of e_Ob are presented.
0 20 40 60 80 100
0,0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
1,0
<X
/I>
/
<X
/I>
m
ax
Z, g/cm2
Eemax= 8 MeV
2 g/cm2
4 g/cm2
6 g/cm2
a
0 20 40 60 80 100
0,0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
1,0
<X
/I>
/
<X
/I>
m
ax
Z, g/cm2
Eemax= 10 MeV
2 g/cm2
4 g/cm2
6 g/cm2
b
Fig. 6. Distribution of relative dose along
the depth of X_Ob
It is evident, that the last parameter affects weakly
on the dose distribution. The X_Ob thickness, provided
the ten-fold dose reduction, Z10, appears greater than
that at the use of a Ta-converter. At the same time, the
dose nonuniformity at a two-sided irradiation makes
~1.8. Therefore, the Z1.5 value, providing the nonuni-
formity of 1.5, was calculated also (Table 2).
Table 2
Thickness of X_Ob
ρ, g/cm2
8 MeV 10 MeV
Z10,
g/cm2
Z1.5,
g/cm2
Z10,
g/cm2
Z1.5,
g/cm2
2 58.9 47.0 57.7 47.0
4 62.5 50.6 64.9 51.8
6 66.1 54.1 67.3 54.1
In Table 3, the results of calculation of capacity of
the e,X-installation in a mode providing the average
dose of 25 and 10 kGy in the electron and X-ray radia-
tion channels, respectively, are listed.
Table 3
Capacity of е,Х-plant
ρ, g/cm2
e-channel,
kg/(mA.h)
X-channel,
kg/(mA.h)
8 MeV 10 MeV 8 MeV 10 MeV
2 509 515 33 67
4 939 1022 28 49
6 1051 1255 26 44
In Fig. 7, the results of simulation and experimental
study of the dose rate distribution on the rear surface of
SM obtained at processing of the disposable medical
attire packed in the cartons each measured
(52×26×26) cm3 and by 4 kg in weight (two boxes was
placed on each transport container) are presented. The
isodose maps, corresponding to absence of a load and its
presence, are given in Fig. 7,a,b, respectively. In the
latter case, the effect of radiation shadow from the load
is revealed. The results of the calculation with the use of
Eq. (2) of dose distribution, corresponding to an actual
treatment mode, are given in Fig. 7. The statistical un-
certainty of the obtained values makes 15% (k=1).
-30 -20 -10 0 10 20 30
-40
-20
0
20
40
Ee = 8,4 MeV
ρ = 0
Y
-a
xi
s,c
m
X-axis,cm
0.4000
6.225
12.05
17.88
23.70
29.52
35.35
41.17
47.00
X/I, kGy/h/mA
a
-30 -20 -10 0 10 20 30
-50
-40
-30
-20
-10
0
10
20
30
40
50
Ee = 8,4 MeV
ρ = 3 g/cm2
Y
-a
xi
s,c
m
X-axis,cm
0.8600
1.540
2.220
2.900
3.580
4.260
4.940
5.620
6.300
X/I, kGy/h/mA
b
Fig. 7. Dose rate map:
а – in absence of е_Ob; b – at the presence of е_Ob
The Harwell Red 4034 dosimetrs (Harwell Dosime-
ters, UK) were used for measuring the dose rate of the
bremsstrahlung radiation. In Fig. 8, the calculated iso-
dose curves at the surface of X_Ob, and also the points
of the dosimeter placement (numerated) are presented.
7.6
1.8
6.6
5.6 4.7
3.7
2.8
1.8
-30 -20 -10 0 10 20 30
-40
-20
0
20
40
Y
-a
xi
s,c
m
X-axis,cm
1
3
2
5
4 6
6
Fig. 8. Dose rate map (actual irradiation mode)
The measured values of the dose rate in the points of
interest are listed in Table 4. It is evident their satisfac-
tory agreement with the calculated data.
Table 4
Bremsstrahlung dose rate in the points of interest
Npoint 1 2 3 4 5 6 7
• X
D , kGy/h⋅mA 3.9 3.5 3.6 5.8 1.9 1.5 2.0
CONCLUSIONS
ISSN 1562-6016. ВАНТ. 2019. №6(124) 167
In an industrial electron accelerator with energy
8 MeV and higher under certain conditions a free extra-
source of X-rays, generated at interaction of accelerated
electrons with processed product, and also with the ele-
ments of the output devices, can be obtained. In a prac-
tical range of electron energy and product surface densi-
ty, the extra-source of radiation provides the possibility
of treatment of various objects, in particular, cultural
artifacts, having the surface density of up to 50 g/cm2
and higher. The dose rate and the size of the secondary
radiation field can be controlled by changing the dis-
tance to X-target. The capacity of the X-channel
amounts up to 50 kg/kGy⋅h per 1 kW of the electron
beam power.
REFERENCES
1. V.L. Uvarov, A.N. Dovbnya, N.A. Dovbnya,
V.I. Nikiforov. Electron Linac Based e,X-Facility //
Proc. of the EPAC 2006 Conf. 2006, p. 2257-2259.
2. Uses of Ionizing Radiation for Tangible Cultural
Heritage Conservation, http:www-pub.iaea.org/MTCD/
Publications/PDF/16-17821_PUB1747_web.pdf
3. V.I. Nikiforov, V.L. Uvarov. Analysis of Mixed
e,X-radiation along the Extraction Facilities of Elec-
tron Accelerators // Atomic Energy. 2009, v. 106(4),
p. 281-286.
4. R.I. Pomatsalyuk, V.A. Shevchenko, A.Eh. Tenishev,
D.V. Titov, V.L. Uvarov, A.A. Zakharchenko. De-
velopment of a Method of Absorbed Dose On-line
Monitoring at Product Processing by Scanned Elec-
tron Beam // Problems of Atomic Science and Tech-
nology. 2016, № 3, p. 149-153.
Article received 11.10.2019
ПОЛУЧЕНИЕ ДВУХПУЧКОВОГО е,Х-РЕЖИМА
НА ПРОМЫШЛЕННОМ УСКОРИТЕЛЕ ЭЛЕКТРОНОВ
В.А. Шевченко, А.Э. Тенишев, В.Л. Уваров, А.А. Захарченко
Проведен анализ условий формирования смешанного е,Х-излучения в выходных устройствах промыш-
ленного ускорителя электронов. Показана возможность получения одновременно с основным каналом облу-
чения продукции пучком электронов дополнительного радиационного канала на основе практически бес-
платного источника тормозных фотонов. Методом компьютерного моделирования изучены условия получе-
ния вторичного излучения в состоянии электронного равновесия при проведении обработки продукции ска-
нирующим пучком электронов в основном радиационном канале. Получена зависимость пространственно-
энергетических характеристик тормозного излучения от спектра первичного пучка электронов и поверх-
ностной плотности обрабатываемого им груза. Для промышленного ускорителя ЛУ-10 ННЦ ХФТИ иссле-
дованы условия обработки объектов в дополнительном радиационном канале. Результаты расчета мощности
дозы тормозного излучения и ее пространственного распределения удовлетворительно согласуются с изме-
ренными в эксперименте. Получены данные по сравнительной производительности установки в обоих ради-
ационных каналах. Дополнительный источник излучения может быть использован для проведения неком-
мерческих программ (например, санитарной обработки объектов культурного наследия).
ОДЕРЖАННЯ ДВОПУЧКОВОГО е,Х-РЕЖИМУ
НА ПРОМИСЛОВОМУ ПРИСКОРЮВАЧІ ЕЛЕКТРОНІВ
В.А. Шевченко, А.Е. Тєнішев, В.Л. Уваров, O.O. Захарченко
Проведено аналіз умов формування змішаного е,Х-випромінювання у вихідних пристроях промислового
прискорювача електронів. Показана можливість отримання одночасно з основним каналом опромінювання
продукції пучком електронів додаткового радіаційного каналу на основі практично безкоштовного джерела
гальмівних фотонів. Методом комп'ютерного моделювання вивчені умови отримання вторинного випромі-
нювання в стані електронної рівноваги при проведенні обробки продукції скануючим пучком електронів в
основному радіаційному каналі. Отримана залежність просторово-енергетичних характеристик гальмівного
випромінювання від спектра первинного пучка електронів і поверхневої щільності оброблюваного ним ван-
тажу. Для промислового прискорювача ЛУ-10 ННЦ ХФТІ досліджені умови обробки об'єктів у додатковому
радіаційному каналі. Результати розрахунку потужності дози гальмівного випромінювання та її просторово-
го розподілу задовільно узгоджуються із зміряними в експерименті. Отримані дані з порівняльної продукти-
вності установки в обох радіаційних каналах. Додаткове джерело випромінювання може бути використане
для проведення некомерційних програм (наприклад, санітарної обробки об'єктів культурної спадщини).
INTRODUCTION
1. FORMATION OF e,X-RADIATION
2. LU-10 е,Х-PLANT
3. RESULTS AND DISCUSSION
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