An autonomous Radon sensor with wireless connectivity has been developed, using a BJT detector on high-resistivity silicon as alpha-particle detector. Charged Radon daughters are collected on the detector surface electrostatically. Thanks to the BJT internal amplification, real-time alpha particle detection is made possible using a very simple readout electronics which records alpha-particle arrival time and charge. Functional tests at known Radon concentrations demonstrated a sensitivity up to 4.9 cph/(100 Bq/m3), which translates into the capability of detecting a Radon concentration of 200±20 Bq/m3 and 500±50 Bq/m3 after 10 and 4 h, respectively. The count rate at nominally-zero Radon concentration was 0.05 cph.
Performance of a Radon Sensor Based on a BJT Detector on High-Resistivity Silicon / A., B., Bidinelli, L., Saguatti, D., G. F., D.B., V., T., Rovati, L., Verzellesi, G., G., B., S., B., F., F., F., D., A., D.G., L., B., I., R., M., B., G., G., M., C., S., P., F., C.. - ELETTRONICO. - (2012), pp. 266-268. (2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record, NSS/MIC 2012 Anaheim, California, USA Oct. 29 - Nov. 3, 2012) [10.1109/NSSMIC.2012.6551105].
Performance of a Radon Sensor Based on a BJT Detector on High-Resistivity Silicon
BIDINELLI, Luca;SAGUATTI, Davide;ROVATI, Luigi;VERZELLESI, Giovanni;
2012
Abstract
An autonomous Radon sensor with wireless connectivity has been developed, using a BJT detector on high-resistivity silicon as alpha-particle detector. Charged Radon daughters are collected on the detector surface electrostatically. Thanks to the BJT internal amplification, real-time alpha particle detection is made possible using a very simple readout electronics which records alpha-particle arrival time and charge. Functional tests at known Radon concentrations demonstrated a sensitivity up to 4.9 cph/(100 Bq/m3), which translates into the capability of detecting a Radon concentration of 200±20 Bq/m3 and 500±50 Bq/m3 after 10 and 4 h, respectively. The count rate at nominally-zero Radon concentration was 0.05 cph.
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