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Vejdani, Alireza, Momennezhad, Mehdi, Mohammadi, Sara, Vejdani Noghreiyan, Vajiheh, Rostami, Atefeh. (1403). The Measurement of Neutron Contamination in High Energy X-Ray Radiotherapy Using a He-3 Gas Dosimeter. , 21(5), 329-335. doi: 10.22038/ijmp.2024.75447.2332
Alireza Vejdani; Mehdi Momennezhad; Sara Mohammadi; Vajiheh Vejdani Noghreiyan; Atefeh Rostami. "The Measurement of Neutron Contamination in High Energy X-Ray Radiotherapy Using a He-3 Gas Dosimeter". , 21, 5, 1403, 329-335. doi: 10.22038/ijmp.2024.75447.2332
Vejdani, Alireza, Momennezhad, Mehdi, Mohammadi, Sara, Vejdani Noghreiyan, Vajiheh, Rostami, Atefeh. (1403). 'The Measurement of Neutron Contamination in High Energy X-Ray Radiotherapy Using a He-3 Gas Dosimeter', , 21(5), pp. 329-335. doi: 10.22038/ijmp.2024.75447.2332
Vejdani, Alireza, Momennezhad, Mehdi, Mohammadi, Sara, Vejdani Noghreiyan, Vajiheh, Rostami, Atefeh. The Measurement of Neutron Contamination in High Energy X-Ray Radiotherapy Using a He-3 Gas Dosimeter. , 1403; 21(5): 329-335. doi: 10.22038/ijmp.2024.75447.2332

The Measurement of Neutron Contamination in High Energy X-Ray Radiotherapy Using a He-3 Gas Dosimeter

Iranian Journal of Medical Physics
دوره 21، شماره 5، آذر و دی 2024، صفحه 329-335    اصل مقاله (1.47 M)
نوع مقاله: Original Paper
شناسه دیجیتال (DOI): 10.22038/ijmp.2024.75447.2332
نویسندگان
Alireza Vejdani1؛ Mehdi Momennezhad2؛ Sara Mohammadi3؛ Vajiheh Vejdani Noghreiyan* 4؛ Atefeh Rostami5
1Physics Department, Faculty of Sciences, University of Neyshabur, Neyshabur, Iran
2Medical Physics Department, Faculty of Medicine, Imam Reza Center of Medical Education and Treatment, Mashhad, Iran
3Medical Physics Department, Faculty of Medicine, Gonabad University of Medical Sciences, Gonabad,Iran
4Medical Physics and Radiological Sciences Department, Sabzevar University of Medical Sciences
5department of medical physics and radiological sciences, Sabzevar university of medical sciences, Sabzevar, Iran
چکیده
 
Introduction: Neutron contamination is likely caused by the collision of high-energy photon interactions (γ, ṉ) with heavy metals used in the construction of the accelerator. This study is essential to quantify the excess dose from neutron contamination by Elekta Precis. The main object is to assess the neutron contamination with a gas dosimeter containing He-3.
 
Material and Methods: In this study, neutron contamination was estimated at different points in and out of the treatment room. We used two types of dosimeters: a He-3 gas dosimeter (CRAMAL 31) as a neutron dosimeter and Farmer ionization chambers, and PC-electrometer (Sun Nuclear, USA) which is sensitive to photons measured photo-neutron doses. Both the neutron and Farmer dosimeters were applied in the presence and absence of acrylic plates at the same point. In this study, Monte Carlo (MC) code was utilized to prepare the correct proportion of neutron dose.
Results: At different points in and out of the treatment room, neutron contamination was approximately in the range of background dose (D = 0.001 µSv). The neutron dosimeter displayed 48.792 µSv, 25.456 µSv and 28.756 µSv for 6, 10 and 15 MV photon energy, respectively. He-3 gas dosimeter showed that the neutron dose net was negligible under the treatment field.
Conclusion: He-3 gas dosimeter detected more than the usual neutron dose in 6 MV photon energy than we expected. Due to the high photon flux under the radiation fields, a He-3 neutron dosimeter reported photo-neutron dose. Nevertheless, the photo-neutron dose was in the range of micro Sievert (µSv). He-3 gas dosimeter was not suitable for neutron dosimetry in places with high photon fluence because of the low energy peak in the detection of neutrons.
 
کلیدواژه‌ها
Linear Accelerator؛ Dosimetry؛ Radiation؛ Neutron Activation Analysis
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