小^(220)Rn室的研究

Study on a thoron chamber with the volume of 125 L

研制了一个125L的小220Rn室。在充220Rn和循环气流流速、风扇转速不变条件下,测量左、右两个侧面上不同位置的采样孔的220Rn水平,相对偏差仅为0.66%,且连续5d在同一采样孔采样测量,测量结果的相对偏差仅为1.6%。系统的总不确定度小于3.5%。

A thoron chamber with the volume of 125L developed consists of three parts. Thoron concentration can be changed by adding different volumes of delay boxes or by controlling gas flow rate in the thoron input circuit. The thoron chamber has a good stability with deviations of 1.6 % in 5days continuous measurement, and a good uniformity with deviations of only 0. 66%. The total uncertainty of the system is less than 3.5%.