Sharpe, P H G; Sephton, J P (1998) Alanine dosimetry at NPL - the development of a mailed reference dosimetry service at radiotherapy dose levels. In: IAEA-SM-356/R6 Proc. International symposium on techniques for high dose dosimetry in Industry, Agriculture and Medicine, 2-5 November 1998, Vienna.

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Abstract

In this paper we describe the work that has been carried out at NPL to develop a mailed alanine reference dosimetry service for radiotherapy dose levels. The service is based on alanine / paraffin wax dosimeters produced at NPL. Using a data analysis technique based on spectrum fitting, it has been possible to achieve a precision of dose measurement better than ±0.05 Gy (1 o). A phantom set has been developed for use in high energy photon beams, which enables simultaneous irradiation of alanine dosimeters and ionisation chambers in a well defined geometry. Studies in photon beams of energies between Co-60 and 20 MeV have shown no significant energy dependence (<1%) for alanine relative to dose determination using a graphite calorimeter. Work is underway to extend the service to electron beams, and preliminary results are presented on the direct calibration of alanine in electron beams using a graphite calorimeter.

Item Type:	Conference or Workshop Item (UNSPECIFIED)
Subjects:	Ionising Radiation Ionising Radiation > Dosimetry
Last Modified:	02 Feb 2018 13:18
URI:	https://eprintspublications.npl.co.uk/id/eprint/1075