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Year : 2016  |  Volume : 39  |  Issue : 4  |  Page : 190-193

Development of an ionization chamber-based high sensitivity detector for the measurement of radiation dose from X-ray whole body scanners

Radiation Safety Systems Division, Bhabha Atomic Research Centre, Trombay, Mumbai, Maharashtra, India

Correspondence Address:
Sunil Kumar Singh
Radiation Safety Systems Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085, Maharashtra
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-0464.199979

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Dose from X-ray-based transmission type whole-body scanner (WBS) is very small and its measurement is a regulatory requirement as recommended by ANSI/HPS N43.17-2009. Measurement of dose of the order of 25 µ R per scan (received by the person screened) requires very sensitive detector/instrument whose response is energy independent. Such systems are not commercially available. In view of this, a large volume, high sensitivity, ionization chamber (IC) was designed and developed for its use in the measurement of reference effective dose from transmission type X-ray-based WBSs. The IC has thin aluminum wall and was tested for direct X-ray beam from 120 to 180 kV. The measured sensitivity for X-ray spectrum from 120 to 180 kV was found to be 41.75 pC/µR with a standard deviation of ± 0.53%. The field uniformity at the measurement distance of 5 m was within ± 5%.

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