小面积表面污染测量方法研究

Research on Measurement Method of Small Area Surface Pollution

从核素种类、发射率数量级、活性区面积变化对表面污染测量仪发射率响应的影响进行了研究,结果表明不能直接使用检定证书上给出的校准因子对所有测量结果进行校准,必须在测量前制作对应的校准系数表。通过巡测和精确测量确定污染区域边界,算出污染区域面积。对比污染区域与探测器窗面积大小关系和污染区域均匀性,确定采用单次测量或多次多点测量,选取对应公式计算出污染区域的表面发射率或表面活度。

The effects of nuclide types,emissivity orders,and active area changes on the emissivity response of the surface contamination meter were studied.The results show that all the measurement results cannot be calibrated directly using the calibration factors given on the verification certificate before making the corresponding calibration coefficient table.Determine the boundary of the polluted area through patrol survey and accurate measurement,and calculate the area of the polluted area.By comparing the relationship between the area of the polluted area and the detector window and the uniformity of the polluted area,it is determined to use a single measurement or multiple multi-point measurements,and select the corresponding formula to calculate the surface emissivity or surface activity of the polluted area.