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ORIGINAL ARTICLE
Year : 2014  |  Volume : 37  |  Issue : 2  |  Page : 80-88

Development of a PIN diode-based on-line measurement system for radon ( 222 Rn) and thoron ( 220 Rn) in the environment


1 Radiation Safety Systems Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India
2 Health Physics Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India
3 Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Trombay, Mumbai, Maharashtra, India
4 Department of Chemical Engineering, Indian Institute of Technology, Powai, Mumbai, Maharashtra, India

Correspondence Address:
P Ashok Kumar
Radiation Safety Systems Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, Maharashtra
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-0464.147281

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A silicon PIN diode-based electrostatic collection type online real-time instrument has been developed for simultaneous measurement of radon ( 222 Rn) and thoron ( 220 Rn). The system, discussed in this paper, utilizes a hemispherical metal chamber (volume 1 L) for active air sampling. Estimation of 222 Rn/ 220 Rn concentration is carried out through alpha spectroscopy of electro-deposited polonium atoms on the detector surface. The system description and the characterization studies carried out with this instrument are presented here. Its performance has been tested with reference equipments. The instrument showed sensitivity of 0.408 counts per hour (CPH)/(Bq/m 3 ) and 0.169 CPH/(Bq/m 3 ) for radon and thoron measurements, respectively, at an optimized collection voltage of + 1.6 kV and relative humidity <10%.


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