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/m^3), which translates into the capability of detecting a Radon concentration of 200±20 Bq/m^3 and 500±50 Bq/m^3 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
Dalla Betta, Gian Franco;Tyzhnevyi, Vladyslav;Rachevskaia, Irina;Boscardin, Maurizio;Giacomini, Gabriele;
2012-01-01
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/m^3), which translates into the capability of detecting a Radon concentration of 200±20 Bq/m^3 and 500±50 Bq/m^3 after 10 and 4 h, respectively. The count rate at nominally-zero Radon concentration was 0.05 cph.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
