Thinová L, Solc J
CTU in Prague, FNSPE, DDAIR, Břehová 7, 115 19 Praha 1, Czech Republic
Czech Metrology Institute, Radiová 1, 102 00 Praha 10, Czech Republic.
Radiat Prot Dosimetry. 2014 Jul;160(1-3):87-91. doi: 10.1093/rpd/ncu108. Epub 2014 Apr 11.
The radon concentration in underground workplaces may reach tens of thousands of Bq m(-3). A simple MCNPXTM Monte Carlo (MC) model of a cave was developed to estimate the influence of radon on the in situ gamma spectrometry results in various geometries and radon concentrations. The detector total count rate was obtained as the sum of the individual count rates due to 214Bi in the air, radon in the walls and deposition of radon daughters on surfaces. The MC model was then modified and used in the natural conditions of the Mladeč Caves, Czech Republic. The content of 226Ra was calculated from laboratory gamma spectrometry measurements, and the concentrations of unattached and attached 214Bi were measured using the FRITRA4 device (SMM-Prague). We present a comparison of the experimental results with results calculated by the MCNPXTM model of the Gamma Surveyor spectrometry probe (GF Instruments) with a 3″×3″ NaI(Tl) detector and a 2″×2″ BGO detector.
地下工作场所中的氡浓度可能达到数万贝克勒尔每立方米（Bq m⁻³）。开发了一个简单的洞穴蒙特卡罗（MC）模型，即MCNPX™模型，以估计在各种几何形状和氡浓度下氡对现场伽马能谱测量结果的影响。探测器的总计数率是空气中214Bi、洞穴壁中的氡以及氡子体在表面沉积所产生的各个计数率之和。然后对该MC模型进行了修改，并应用于捷克共和国姆拉代克洞穴的自然条件下。通过实验室伽马能谱测量计算出镭-226的含量，并使用FRITRA4设备（布拉格SMM）测量未附着和附着的214Bi的浓度。我们将实验结果与使用配备3英寸×3英寸碘化钠（铊）探测器和2英寸×2英寸锗酸铋探测器的伽马能谱仪探头（GF仪器）的MCNPX™模型计算的结果进行了比较。
