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The influence of shielding reinforcement in a vault with limited dimensions on the neutron dose equivalent in vicinity of medical electron linear accelerator

Ana Ivkovic
Ana Ivkovic
, 
Dario Faj
Dario Faj
, 
Mladen Kasabasic
Mladen Kasabasic
, 
Marina Poje Sovilj
Marina Poje Sovilj
, 
Ivana Krpan
Ivana Krpan
, 
Marina Grabar Branilovic
Marina Grabar Branilovic
 oraz 
Hrvoje Brkic
Hrvoje Brkic
   | 02 maj 2020
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Article Category: Research Article
Data publikacji: 02 maj 2020
Zakres stron: 247 - 252
Otrzymano: 02 lut 2020
Przyjęty: 11 mar 2020
DOI: https://doi.org/10.2478/raon-2020-0024
© 2020 Ana Ivkovic, Dario Faj, Mladen Kasabasic, Marina Poje Sovilj, Ivana Krpan, Marina Grabar Branilovic, Hrvoje Brkic, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Figure 1

Top view (down) of the vault where Siemens Oncor Expression accelerator at Osijek University Hospital is placed with marked positions of measurements. (A), (B) and (D) are positions outside the vault, (C) and E are inside the vault. Position E is in isocenter.
Top view (down) of the vault where Siemens Oncor Expression accelerator at Osijek University Hospital is placed with marked positions of measurements. (A), (B) and (D) are positions outside the vault, (C) and E are inside the vault. Position E is in isocenter.

Figure 2

Ne utron spectra in measuring positions (A), (B), (C), (D) and (E) for photon field size 10 x 10 cm2 and gantry angles 0° and 270°. (E – 1) is normalized neutron spectrum in measuring position E for simulations with and without vault.
Ne utron spectra in measuring positions (A), (B), (C), (D) and (E) for photon field size 10 x 10 cm2 and gantry angles 0° and 270°. (E – 1) is normalized neutron spectrum in measuring position E for simulations with and without vault.

Figure 3

Normalized neutron fluence obtained from MC calculations according to the place of origin for all measuring positions and gantry angles 0° and 270°.
Normalized neutron fluence obtained from MC calculations according to the place of origin for all measuring positions and gantry angles 0° and 270°.

Neutron dose equivalents in μSv per Gy photon dose in isocenter for all measuring positions and gantry angles 0° and 270°

Gantry 0°Gantry 270°
ABCDEABCDE
(μSv/Gy)(μSv/Gy)(μSv/Gy)(μSv/Gy)(μSv/Gy)(μSv/Gy)(μSv/Gy)(μSv/Gy)(μSv/Gy)(μSv/Gy)
PojeLR 1150.040.08100.040.10.17200.13
et al.5Active detector0.0520.114.30.052
Our0.0080.00068.21.3∙10-1232970.010.00410.34.21∙10-113333
resultsCR-39(0.0006)(0.00004)(0.6)(7∙10-14)(264)(0.008)(0.0002)(0.5)(2∙10-12)(202)

Total MC calculated neutron fluence in measuring positions A, B, C, D and E for gantry angles 0° and 270°. Neutron fluence is in number of neutrons per cm2 per electron impinging on target. Results are normalized to source particle

Measuring position
Gantry angleABCDE
0°5.6 ∙ 10-135.3 ∙ 10-143.6 ∙ 10-108.4 ∙ 10-241.5 ∙ 10-8
270°6.6 ∙ 10-133.4 ∙ 10-144.2 ∙ 10-101.6 ∙ 10-221.5 ∙ 10-8

Calibration coefficients for neutron detector CR-39 for measuring positions C and E for gantry angles 0° and 270°

PositionG 0°G 270°
μSv/(track/mm2)μSv/(track/mm2)
C6,5211,20
E151,61194,97
eISSN:
1581-3207
Język:
Angielski
Częstotliwość wydawania:
4 razy w roku
Dziedziny czasopisma:
Medicine, Clinical Medicine, Internal Medicine, Haematology, Oncology, Radiology
Kanał RSS czasopisma