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生物组织中自由水氚测量的不确定度评定

Uncertainty Analysis of Tissue Free Water Tritium Determination in Biological Tissue

中文摘要英文摘要

本文通过生物组织自由水氚的计算模型评定测量的不确定度。使用GUM法评定出该检测方法的不确定度分量主要有样品含水率的不确定度、样品测量净计数率引入的不确定度、方法探测效率刻度的不确定度和测量样品重量的不确定度。经各分量的计算发现样品含水率的相对标准不确定度、测量样品重量的相对标准不确定度相对较小,可忽略不计。方法效率的相对不确定度主要受效率刻度时加入标准源的活度大小和标准源自身的不确定度影响。影响检测方法不确定度最大的是样品的净计数率。当样品比活度在本底水平附近时,检测方法的不确定度主要由样品净计数率引起的不确定度而贡献。

his paper evaluates the uncertainty of tissue free water tritium determination through the calculation model. The GUM method is used to evaluate the uncertainty of the detection method. The uncertainty components mainly includes the uncertainty of the moisture content of the sample, the uncertainty of the net counting rate of the sample measurement, the uncertainty of the detection efficiency of the method and the uncertainty of weight of the sample. After the calculation of each component, it is found that the relative standard uncertainty of the moisture content of the sample and the relative standard uncertainty of measuring the sample weight are relatively small, which can be ignored. The relative uncertainty of method efficiency is mainly affected by the activity of the standard source added to the efficiency calibration and the uncertainty of the standard source itself. The net counting rate of the sample is the most affected by the uncertainty of the detection method. When the sample radioactive specific activity is close to the background level, the uncertainty of the detection method is mainly contributed by the uncertainty caused by the net counting rate of the sample.

郭小翠

10.12074/202409.00258

化学化工

自由水氚不确定度不确定度分量

郭小翠.生物组织中自由水氚测量的不确定度评定[EB/OL].(2024-09-30)[2024-10-05].https://chinaxiv.org/abs/202409.00258.点此复制

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