The performance verification and result analysis of Alpha, Beta surface contamination meter / 中国医学装备

ABSTRACT

Objective:To summarize the performance of surface contamination meters was using through applied national standard to calibrate them so as to provide helpful suggestion for radiation protection.Methods: 18 surface contamination meters were enrolled in this research. Depend on the national standard (GB/T 5202-2008/IEC 603252002) to implement calibration. In the calibration, two groups of241Am alpha plane source and two groups of204T1 beta plane source were chosen as standard source. The holder was used to fix the distance of measurement between source and detector, and then the efficiency of apparatus, statistical fluctuation and relative inherent error were measured depended on the standard procedure.Results: The efficiency of apparatus of 18 surface contamination meters in detection forαray mainly focused on 20%-40%, and forβ ray, it mainly focused on 20%-60%. All of statistical fluctuations of 18 meters forαray were lower than 10%, and forβ ray, there were 14 meters were lower than 10% and 4 meters focused on 10%-20%. In the measurement of relative inherent error, most of results were lower than 6%.Conclusion: The performances of 18 surface contamination meters conform with national standards, although individual indicator of individual apparatus still lower than the level of same kind of apparatus. This paper recommends paramedic should pay attention to maintain the apparatus, and ensure the normal function and measurement accuracy of apparatus so as to provide strong support for radiation protection.