Dose equivalent response of a TLD badge--influence of body backscatter
- Bhabha Atomic Research Center, Bombay (India)
In personnel monitoring, operational quantities recommended by ICRU Publication No. 39 for photon radiation can be realized by calibrating dosimeters on a phantom and considering body backscatter photons by using established conversion factors. Personnel dosimeters used in this study are based on CaSO4:Dy Teflon thermoluminescence dosimeter discs (TLD) that have a highly photon energy-dependent response. Since body backscattered photons have lower energies than the incidence photons, methods for correcting for energy dependence of both the incident and body backscattered photons have to be developed. By using readouts of two TLD discs (one under a composite metal filter and the other without a metal filter) in an empirical relation valid at all energies, it is possible to correct for the effect of change in response from change in the photon energies. It was found that the new operational quantities recommended by ICRU could be estimated to within +/- 15% by a TLD badge design based on this method. Angular dependence limits for photons in accordance with the new international standards and a high beta dose-equivalent discrimination in the mixed fields of beta and low-energy x rays could also be achieved.
- OSTI ID:
- 6413665
- Journal Information:
- Health Physics; (USA), Journal Name: Health Physics; (USA) Vol. 59:3; ISSN 0017-9078; ISSN HLTPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
655003* -- Medical Physics-- Dosimetry
BACKSCATTERING
CALIBRATION
DOSE EQUIVALENTS
DOSEMETERS
DOSES
DOSIMETRY
ELEMENTARY PARTICLES
LUMINESCENT DOSEMETERS
MASSLESS PARTICLES
MEASURING INSTRUMENTS
MOCKUP
MONITORING
PERSONNEL MONITORING
PHANTOMS
PHOTONS
RADIATION DOSES
RADIATION MONITORING
SCATTERING
STRUCTURAL MODELS
THERMOLUMINESCENT DOSEMETERS
THERMOLUMINESCENT DOSIMETRY