Thinová L, Burian I
Department of Dosimetry, Czech Technical University in Prague, 110 00 Prague 1, Czech Republic.
Radiat Prot Dosimetry. 2008;130(1):48-51. doi: 10.1093/rpd/ncn118. Epub 2008 Apr 24.
The new RAMARN system for radon volume activity measurement was developed in 2003 and has been in use since then. RAMARN system consists of a plastic chamber that is conically cylindrical in shape and about 0.5 l in volume; a bare Kodak LR 115 is located on the bottom of this diffusion chamber. The size was chosen to avoid the influence of deposited decay products of radon. Kodak has a spectrometric character--the tracks are visualized only for alphas with energies between 1 and 3 MeV that touch the foil; thus the effective volume has a lens shape. The response therefore corresponds to diffused radon and half of (218)Po born by radon gas decay. The experiments described below were conducted as one part of a routine methodology control, focused on classifying worker irradiation from natural ionizing radiation sources in show caves and in caves used for speleotherapy.
新型氡体积活度测量系统RAMARN于2003年研发成功，自那时起投入使用。RAMARN系统由一个塑料腔室组成，该腔室呈圆锥筒形，体积约为0.5升；在这个扩散腔室的底部放置了一张裸露的柯达LR 115。选择该尺寸是为了避免氡沉积衰变产物的影响。柯达具有能谱特性——只有能量在1至3 MeV之间且接触箔片的α粒子的径迹才能显现出来；因此有效体积呈透镜形状。所以，其响应对应于扩散的氡以及氡气衰变产生的一半（218）钋。下述实验是作为常规方法控制的一部分进行的，重点是对来自天然电离辐射源（如洞穴展示场所和用于洞穴疗法的洞穴）的工人辐照进行分类。
