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Abstract
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Article Information:
Preliminary Investigations of the Contribution of Scatter Radiation during Calibration of TLD-100 using a Cs-137 Panoramic Source
J.K. Annkah, E.O. Darko, J.K. Amoako, G. Emi-Reynolds, M.K. Obeng and G. Royle
Corresponding Author: James Kwame Annkah
Submitted: 2011 June, 12
Accepted: 2011 August, 08
Published: 2011 September, 20 |
Abstract:
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Studies were carried out to determine the contribution of secondary photons to the calibration set-up
of a Secondary Standard Dosimetry Laboratory. In these studies the response of LiF:Mg TLD-100 to known
exposures using Cs-137 panoramic-source were investigated. Each TLD chip showed a linear dose response
to radiation, demonstrating a typical characteristic of LiF:Mg chips. Whilst TLDs showed an acceptable
response range for radiation protection purposes, the percentage differences observed were higher. The relative
response values ranged from 0.91 to 1.52. These values indicated the presence of scatter contributing to the
exposures. While a contribution of 28.1% was contributed to an exposure of 1mSv and 48.3% being added to
an exposure of 2mSv, the integrity of the calibration TLDs used for personnel monitoring may not be justified.
The set-up may be used for calibrating dosimeters with correction for scattered photons and collimating the
beam from the Cs-137 source.
Key words: Air kerma, anneal, collimation, source to surface distance, , ,
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Cite this Reference:
J.K. Annkah, E.O. Darko, J.K. Amoako, G. Emi-Reynolds, M.K. Obeng and G. Royle, . Preliminary Investigations of the Contribution of Scatter Radiation during Calibration of TLD-100 using a Cs-137 Panoramic Source. Research Journal of Applied Sciences, Engineering and Technology, (09): 874-879.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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