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      Cross-talk elimination in determination of gross α and gross β activities using a low-background α/β gas-flow proportional counter

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          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.

          Abstract

          摘要: 目的 探索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。 方法 在CLB-104型低本底α/β测量仪(流气式正比计数管低本底α/β测量仪)上, 首先提高α阈值消除β粒子在α道引起的串道计 数; 其次下调α-β反符合阈值消除低能α粒子在β道引起的串道计数, 并对β计数进行修正消除内转换电子在P道引 起的计数;最后测定不同放射性水平的非盐碱水样品总α、总β放射性, 并与 BH 1227 型低本底α/β测量仪(固体闪烁 探测器低本底α/β测量仪)上测定同一样品总α、总β放射性相比较以验证串道消除方法的有效性。 结果 经消除β、α粒子在α、β道的串道计数及扣除内转电子在β道的计数后, CLB-104 型低本底α/β测量仪测定同一样品的总α、总 β放射性与 BH1227 型低本底α/β测量仪测定的总α、总β放射性一致。 结论 低能α粒子、β粒子串道可通过调整相 应的阈值消除, 内转换电子在β道的计数可通过修正消除。

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          Author and article information

          Journal
          CJRH
          Chinese Journal of Radiological Health
          Chinese Preventive Medical Association (Ji’an, China )
          1004-714X
          01 December 2023
          01 April 2024
          : 32
          : 6
          : 679-684
          Affiliations
          [1] 1Huizhou Institute for Occupational Health, Huizhou 516008 China
          Article
          j.issn.1004-714X.2023.06.015
          10.13491/j.issn.1004-714X.2023.06.015
          6c24a776-de40-45db-9c64-2221f3984224
          © 2023 Chinese Journal of Radiological Health

          This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 Unported License (CC BY-NC 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See https://creativecommons.org/licenses/by-nc/4.0/.

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          Journal Article

          Medicine,Image processing,Radiology & Imaging,Bioinformatics & Computational biology,Health & Social care,Public health
          Low-background α/β gas-flow proportional counter,Cross-talk elimination,Determination of gross α and gross β activities

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