Response Characteristics of Dual MOSFET Gamma-Ray Sensors Produced by Mitel Corporation

摘要

Radiation-sensitivity measurements were carried out on two batches of dual MOSFET gamma-radiation sensors produced by Mitel Corp and packaged using different procedures by two other commercial firms. Significant differences were observed between the two production batches and also as a result of the difference in packaging. Those from the first Mitel batch packaged by Siltronics Limited were found to be most consistent and should be acceptable as sensor for the Canadian Forces individual dosimeter. Nonuniformities in response with photon energy can be attributed to the large amounts of gold in the packages used and measurements indicate that elimination of the gold will lead to good energy response. A reduced response at very high dose rate is alleviated by the addition of capacitance to maintain gate bias during the radiation pulse, but further testing will be required to evaluate the dosimeter performance under relevent field conditions.