DIURNAL-VARIATIONS IN A SEALED RADON CHAMBER

被引：5

作者：

GILBOY, WB

JAMES, PR

FARMER, CP

BEARD, JE

机构：

[1] Department of Physics, University of Surrey, Guildford

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 1990年 / 299卷 / 1-3期

关键词：

D O I：

10.1016/0168-9002(90)90871-3

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

During experiments to calibrate a radon-in-air counter, some unexpected diurnal variations have been observed. Inside the sealed stainless-steel chamber of a nominal volume of 3 litres, ionised Po-218 atoms from the alpha-decay of Rn-222 are attracted by an electric field to a ZnS(Ag) scintillation screen via which subsequent alpha-decay events are detected. Results for this configuration are presented and also for a modified version in which the scintillation screen is replaced by a high-resolution-alpha-detector. Ambient temperature changes were suspected to be responsible for the observed counting-efficiency variation and this has been confirmed by operating the wall of the chamber at various temperatures between 0-degrees-C and about 40-degrees-C, which revealed a positive temperature coefficient of approximately 1%/degrees-C at 25-degrees-C. Possible reasons for this effect are considered.

引用

页码：690 / 695

页数：6