Kijima Kenta, Monzen Hajime, Matsumoto Kenji, Tamura Mikoto, Nishimura Yasumasa
Department of Medical Physics, Graduate School of Medical Science, Kindai University, Osaka, Japan.
Department of Radiology, Otsu City Hospital, Shiga, Japan.
Anticancer Res. 2018 Jul;38(7):3919-3927. doi: 10.21873/anticanres.12677.
BACKGROUND/AIM: A newly-introduced tungsten containing rubber (TCR) is a potentially useful shielding material in electron radiotherapy because it is lead-free, containing as much as 90% fine tungsten powder by weight. This study aimed to investigate the shielding ability of TCR against electron beams.
Transmission of TCR was measured for energies of 4, 6, 9 and 12 MeV. Dose profiles were measured to compare the TCR and lead. The electron backscatter factor (EBF) was also compared.
The transmission of equivalent thickness for 4, 6, 9 and 12 MeV with TCR (0.78%, 1.34%, 2.16% and 3.08%, respectively) were lower than that with lead (0.81%, 1.44%, 2.19% and 3.16%, respectively) (p<0.05). The dose profiles were not significantly different for TCR and lead. The EBF with TCR was up to 17% lower than that with lead.
TCR has adequate radiation shielding ability for electron beams and could be employed instead of lead.
背景/目的：一种新引入的含钨橡胶（TCR）是电子放射治疗中一种潜在有用的屏蔽材料，因为它不含铅，按重量计含有高达90%的细钨粉。本研究旨在调查TCR对电子束的屏蔽能力。
测量了TCR在4、6、9和12 MeV能量下的透射率。测量剂量分布以比较TCR和铅。还比较了电子反向散射因子（EBF）。
TCR在4、6、9和12 MeV时等效厚度的透射率（分别为0.78%、1.34%、2.16%和3.08%）低于铅（分别为0.81%、1.44%、2.19%和3.16%）（p<0.05）。TCR和铅的剂量分布无显著差异。TCR的EBF比铅低达17%。
TCR对电子束具有足够的辐射屏蔽能力，可替代铅使用。
