Hayes Robert
Radiological Technology, MS 452-09, WIPP Site, PO Box 2078, Carlsbad, NM 88221, USA.
Health Phys. 2003 Nov;85(5 Suppl):S81-4. doi: 10.1097/00004032-200311002-00008.
The root cause of many false continuous air monitor (CAM) alarms is revealed for CAMs that use constant spectral shape assumptions in transuranic (TRU) alpha activity determination algorithms. This paper shows that when atmospheric radon levels continually decrease and bottom out at a minimum level, reduced false TRU count rates are not only expected but measured. Similarly, when the radon levels continually increase to a maximum level, elevated false TRU count rates were measured as predicted. The basis for expecting this dependence on changes in radon levels is discussed.
对于在超铀（TRU）α活度测定算法中使用恒定光谱形状假设的连续空气监测仪（CAM），揭示了许多错误警报的根本原因。本文表明，当大气氡水平持续下降并降至最低水平时，不仅预期而且实测到错误的TRU计数率会降低。同样，当氡水平持续增加到最高水平时，实测到错误的TRU计数率如预测的那样升高。讨论了预期这种对氡水平变化的依赖性的依据。
