当前位置: X-MOL 学术Radiat. Meas. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Monte-Carlo simulations with mathematical phantoms to investigate the effectiveness of a whole-body counter for thyroid measurement
Radiation Measurements ( IF 1.6 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.radmeas.2020.106335
Kotaro Tani , Yu Igarashi , Eunjoo Kim , Takeshi Iimoto , Osamu Kurihara

Abstract FASTSCAN (Canberra, Meriden, CT, USA), a standing-type whole-body counter with upper and lower NaI(Tl) detectors, has been mostly used to determine local residents’ level of internal contamination with 134/137Cs following the Fukushima Daiichi Nuclear Power Plant (FDNPP) disaster in 2011. In the present study, we performed Monte-Carlo simulations with age-specific mathematical human phantoms to investigate the counting efficiencies of the FASTSCAN counter for 131I thyroid measurements. As a result, although the lower detector had low sensitivity for 131I in the thyroids of the adult and 15 y phantoms as well as the 10 y phantom standing on a 30-cm-high stool, the response of this detector may be used as an indicator of surface contamination overlooked on a subject. The total counting efficiency investigated in this study was 0.017–0.018 (cps/Bq) among all age groups. Based on this sensitivity, the determination level for thyroid activity could be calculated to be ~300 Bq under the slightly elevated background radiation level observed after the FDNPP disaster.

中文翻译:

用数学模型进行蒙特卡罗模拟,以研究全身计数器对甲状腺测量的有效性

摘要 FASTSCAN (Canberra, Meriden, CT, USA) 是一种带有上下 NaI(Tl) 探测器的立式全身计数器,主要用于确定福岛核事故后当地居民的 134/137C 内部污染水平。 2011 年第一核电站 (FDNPP) 灾难。在本研究中,我们使用特定年龄的数学人体模型进行蒙特卡罗模拟,以研究 FASTSCAN 计数器对 131I 甲状腺测量的计数效率。因此,虽然下探测器对成人甲状腺中的 131I 和 15 年体模以及站在 30 厘米高凳子上的 10 年体模的灵敏度较低,但该探测器的响应可用作被忽视的表面污染指标。本研究中调查的总计数效率为 0.017-0。018 (cps/Bq) 在所有年龄组中。基于这种敏感性,在 FDNPP 灾难后观察到的略微升高的背景辐射水平下,甲状腺活动的测定水平可以计算为~300 Bq。
更新日期:2020-07-01
down
wechat
bug