Portable radiation and light detector using a p-i-n silicon diode

Abstract

A portable survey instrument using a silicon p-i-n diode as thepdiation detector has been designed. It can be used to measure exposure rates in ths-renge 50 mR/hr to 10 R/min, or exposures between 1 mR and 10 R. The radiation waveform can be visualized by attaching an oscilloscope to the output of the instrument. The response per roentgen of the instrument shows a variation of 8% in the HVT range from 2 to 8 mm Al. When used as a detector of optical radiation in conjunction with a Wratten No. 102 filter, the spectral response closely matches the Stendard C.I.E. luminosity curve. The instrument can, therefore, also be used to measure the luminance of fluoroscopic screens to determine the conversion efficiency of conventional fluoroscopes as well as image intensified fluoroscopes.