A pocket gamma ray monitor including semiconductor detector and numerical display

For designing small size, low power consumption gamma ray monitor the possibilities of convenient characteristics of commercially available semiconductor detector are used. The developed instrument unites possiblilities of adopted simple signal processing system and data indication. Realised pocket gamma ray monitor has good operating characteristics, and domain of use determined by the applied detector. Measurement of dose rate under 1 μC x kg-1s-1 is possible with BPX-1400 semiconductor detector made by Videoton-Remix. Relative sensitivity of realised monitor in temperature range of -100C to +400C is less than 6%. Relative sensitivity lies between -4% and +0.5%, for voltage supply change of 3.3 V to 4.7 V. Characteristics of this solution are analised and compared with cases when GM tube is used. Conclusion concerning the use of this type of solution are given. (Author)