| 周强,拓飞,姚帅墨,张京,李文红,李则书.LabSOCS无源效率刻度软件验证与测量研究[J].中华放射医学与防护杂志,2018,38(4):291-296 |
| LabSOCS无源效率刻度软件验证与测量研究 |
| Validation of the Laboratory Sourceless Calibration Software (LabSOCS) on measurement |
| 投稿时间：2017-10-23 |
| DOI：10.3760/cma.j.issn.0254-5098.2018.04.009 |
| 中文关键词: 无源效率刻度 γ能谱 自吸收校正 |
| 英文关键词:Sourceless calibration γ-spectrometry Self-absorption correction |
| 基金项目:科技部基础性工作专项资金（2014FY211000） |
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| 摘要点击次数: 3031 |
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| 中文摘要: |
| 目的 检验LabSOCS无源效率刻度软件在实际样品测量中的应用效果，对样品自吸收校正和级联辐射符合相加修正进行分析。方法 利用实验室γ谱仪对某公司的两个标准样品进行一系列的测量。采用LabSOCS无源效率刻度软件生成的效率对测量结果进行计算。与证书标准值进行比较，验证分析各核素的计算结果。结果 LabSOCS无源效率刻度软件可以较好地解决γ能谱测量分析中的样品自吸收校正问题，宽能型高纯锗γ能谱仪采用LabSOCS分析的241Am和109Cd结果与标准值的最大偏差<4%，但对于级联辐射引起的符合相加修正还不能直接解决。结论 LabSOCS无源效率刻度软件通过对样品的成分、密度等信息的精准描述，可以较好地解决样品自吸收校正问题。但当分析带有级联辐射的核素时，仍需对符合相加效应加以考虑。可以利用LabSOCS灵活的模拟方式，增加带有级联核素样品到探测器的距离，完成级联核素的精准测量。 |
| 英文摘要: |
| Objective To validate the effect of the Laboratory Sourceless Calibration Software (LabSOCS) in the actual sample measurement, and to study the effect of sample self-absorption correction and cascade radiation coincidence correction. Methods Two standard samples from the analytics company were measured using the two gamma spectrometers at our laboratory. The result were calculated using the efficiency generated by LabSOCS. Calculated result of each nuclide were analyzed. Results were compared with the standard value provided in the certificate. Results The LabSOCS may solve the problem of sample self-absorption correction in gamma energy spectrum measurement and analysis. The maximum deviation between the values of 241Am and 109Cd analyzed by LabSOCS and the reference value was less than 4% for the broad-energy high-purity germanium gamma-ray spectrometers. However, the coincidence additive correction caused by cascade radiation could not be solved directly. Conclusions The research shows that the LabSOCS can solve the problem of sample self-absorption correction by describing the composition and density of the samples accurately. However, when analyzing the nuclides with cascade radiation, the coincidence addition effects should be considered. The flexible simulation method of the LabSOCS can be used to increase the distance from the cascade nuclide sample to the detector and to complete the accurate measurement of the cascade nuclide. |
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