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Year : 2019  |  Volume : 42  |  Issue : 1  |  Page : 15-21

A new look at blind test procedures in personnel monitoring

1 Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India
2 Department of Physical Sciences, Homi Bhabha National Institute, Mumbai, Maharashtra, India

Correspondence Address:
Sneha Chandrasekhar
Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Anushaktinagar, Mumbai - 400 094, Maharashtra
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/rpe.RPE_7_19

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In India, a single type of dosimeter is used all over the country for estimation of occupational doses due to X, beta, and gamma radiations. The quality assurance program of external personnel monitoring in India includes an annual announced test and periodic blind tests. The announced test carried out by a central agency includes various energies and angles of irradiation. Blind tests are carried out by specified users of personnel monitoring service who are distributed throughout the country. Due to the lack of easy availability of various energy sources, blind tests are mostly carried out for a single energy. Analysis of the results is carried out by means of ANSI criteria or trumpet curve analysis which may not be sufficiently stringent given that a single energy and angle are used. In view of this and also to meet the specific requirements of the Indian monitoring scenario, keeping in mind existing practices, an attempt is made to have a new look at the analysis of blind test results. The criteria which have been considered are zeroing of dosimeters, coefficient of variation, and bias. The results of a blind test based on harmonized procedures can be utilized to understand the actual quality of service and also identify deviations in procedures, if any.

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