期刊论文

中文

原子能科学技术

1000-6931

2002

36

1

89-92

10.3969/j.issn.1000-6931.2002.01.021

本校为第一机构

用有机玻璃板制作了一350 mm×250 mm×180 mm的 220Rn积累箱,用特制的闪烁室测量 220Rn室内 220Rn水平,闪烁室测量 220Rn的刻度因子是用标准氡源刻度其对氡及其子体释放α粒子的探测效率,并经能量修正后得到. 220Rn源和循环气流混合后以约13 Lmin-1充进积累箱,其 220Rn水平通过充源回路添加不同体积的延迟箱和气体流量的控制加以调节.在充源和循环气流条件不变时,测量充源孔和循环孔所在两个侧面上不同位置采样孔的 220Rn水平,测量结果的相对标准偏差为0.3%;每1 h测量一次,连续10 h在同一采样孔采样,测量结果的相对标准偏差为1.0%.系统总不确定度小于5.6%.

A 220 Rn accumulation box with the size of 350 mm×250 mm×180 mm is made of perspex plate. 220 Rn level in the chamber is monitored by a special scintillation cell. The calibration factor for 220 Rn concentration measurement is determined by the detection efficiency of α particles emitting from radon and its progenies. 220 Rn gas and circulation air are mixed together before entering the accumulation box with a flow rate of about 13 L/min. 220 Rn concentration can be changed by adding different volumes of delay boxes or by controlling gas flo...