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ARTICLE
Year : 2011  |  Volume : 34  |  Issue : 4  |  Page : 257-261

Thoron interference test of different continuous passive radon monitors


Department of Atomic Energy, Environmental Assessment Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India

Correspondence Address:
C G Sumesh
Department of Atomic Energy, Environmental Assessment Division, Bhabha Atomic Research Centre, Trombay, Mumbai
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-0464.106187

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The instruments measuring radon concentration without energy discrimination may have some sensitivity towards thoron concentration. In the present paper, thoron interference tests of a pulse - ionization - chamber - type instrument - Alpha Guard and a semi - conductor - based instrument - Radon Scout Plus (RSP) have been studied in detail. The instruments are compared with a standard active radon - thoron discriminating monitor - RAD7. As a result 9% interference in measured radon concentration for the Alpha Guard monitor and 4% interference for the RSP monitor were observed. The results obtained indicate that the interference of thoron in radon monitors depends on the area of diffusion of gas, volume of detection and sensitivity factor of the monitor.


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