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Personal Radiation Detector (PRD) γ-Tracer GT2-1 had been developed with focus on gamma-radiation detection, search and gamma-radiation source localization function, enhanced PRD features and isotope energy pattern analysis. The device complies general requirements and includes all regular PRD class device features as well as supplementary modes as Multi-Channel Scaling (MCS), Spectrometer, Librarian driven analysis and Data Log recorder. The GT2-1 uses detector module build around 0.4 cm3 counting grade planar CdZnTe detector. Choice of CdZnTe brings high efficiency of gamma-radiation registration and low energy discrimination level down to 30 keV while volume used is small. GT2-1 is made with power consumption in mind, typical lifetime after full battery charge exceed 600 hours in a measurements mode. Energy compensation techniques are employed for dose rate calculation. Typical accuracy in the energy range of 30– 1500 KeV is better then 10% for factory calibrated devices. GT2-1 is featuring librarian driven isotope identification function. Basic concept is use of library of pre-calibrated user-defined isotope patterns being compared with isotope under test. Identification algorithm is made to evaluate isotope energy pattern match. Algorithm execution results in tested isotope and library match and results indication in graphical form. The device search mode employs proprietary Background Variation Tracking (BVT) algorithm. Implemented search and gamma-radiation source localization mechanisms facilitate the user in fast (1–3 sec) detection of weak gammaradiation sources with intensity in 1.5–3 times exceeding the background level. Analysis of time intervals between adjacent pulses in the input sequence is used to yield numeric characteristics that further displayed in user-friendly graphical form. Dedicated GUI approach and sound capabilities are tailored to search activity flow and aimed to gain operator experience. Dedicated Search algorithm implementation allows to use the device as a home land security detector by services responsible for radioactive materials relocation control like those in the airports, border control, toll, etc. Test results of GT2-1 in Search mode are presented.

PERSONAL RADIATION DETECTOR γ-TRACER GT2-1 WITH A CdZnTe DETECTOR