| 摘要 |
A radiation-detecting probe instrument has a forward working portion housing a radiation detector and a rearward user directed portion, and is in communication with a control assembly for processing and outputting signals received from the radiation detector correlative to a located radionuclide source emitting energy above 88 KeV (for Pb). The disclosed probe instrument forward portion has an annular housing having a radiation transparent tip. The radiation detector is disposed behind the radiation transparent tip. A characteristic x-ray radiation emitting wafer (e.g., Pb) is disposed either between or behind the radiation transparent tip and the radiation detector. A radiation resistant (e.g., W) shield is disposed between the annular housing and the radiation detector and the characteristic x-ray emission wafer. Radiation emitted from the radionuclide source strikes the wafer causing the wafer to emit the characteristic x-ray radiation of the wafer material, which strikes the radiation detector for generating signals for communication to the said control assembly.
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