Cross-talk elimination in determination of gross α and gross β activities using a low-background α/β gas-flow proportional counter
10.13491/j.issn.1004-714X.2023.06.015
- VernacularTitle:流气式正比计数管低本底α /β测量仪测定总α与总β放射性时的串道消除方法探究
- Author:
Pin OU
1
;
Yucheng LI
1
;
Xueting ZHENG
1
;
Huiyuan YOU
1
Author Information
1. Huizhou Institute for Occupational Health, Huizhou 516008 China.
- Publication Type:OriginalArticles
- Keywords:
Low-background α/β gas-flow proportional counter;
Determination of gross α and gross β activities;
Cross-talk elimination
- From:
Chinese Journal of Radiological Health
2023;32(6):679-684
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore cross-talk elimination method in the determination of gross α and gross β activities using a low-background α/β gas-flow proportional counter. Methods A CLB-104 low-background α/β gas-flow proportional counter was used in this study. First, the α threshold was increased to eliminate the cross-talk counting caused by β particles in the α channel. Then, the α-β anticoincidence threshold was reduced to eliminate the cross-talk counting induced by low-energy α particles in the β channel, and β counts were corrected to eliminate the counts induced by internal convention electrons in the β channel. Finally, gross α and gross β activities of non-saline water samples with different activity levels were determined and compared with gross α and gross β activities of the same samples determined on a BH1227 low-background α/β solid scintillation counter, in order to verify effectiveness of the cross-talk elimination method. Results By eliminating the cross-talk counts of β particles in the α channel and the cross-talk counts of α particles in the β channel, and deducting the counts of internal convention electrons in the β channel, the gross α and gross β activities of the same samples determined by CLB-104 were consistent with the values determined by BH1227. Conclusion Cross-talk counts induced by low-energy α particles or β particles can be eliminated by threshold adjustment, and the counts caused by internal convention electrons in the β channel can be eliminated by correction.
