Determination of differential dose rates in a mixed beta and gamma field using shielded Al2O3:C : Results of Monte Carlo modelling

M.C. Aznar, R. Nathan, A.S. Murray, L. Bøtter-Jensen

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    Abstract

    Mixed beta and gamma heterogeneous radiation fields are found in many circumstances, ranging from retrospective dosimetry to medical therapy treatments. It can be very important to provide a direct measurement of the contribution to dose rate from beta particles and gamma rays separately, especially when heterogeneity is on a scale comparable to the range of beta particles (a few mm). In the retrospective dosimetry of heterogeneous sites, in situ measurement at a point may be the only practical method of measuring the appropriate dose rate. Only if the beta and gamma contributions are measured separately can the appropriate water content and grain attenuation corrections be applied. Such corrections are also essential if the full potential of direct dose rate measurement in reducing the overall uncertainty in a luminescence age to much below 5% is ever to be realised.

    In this paper we outline the results of our modelling of the most appropriate encapsulation for Al2O3: C luminescence dosimeters when used to measure the dose rate from natural radiation fields. We consider a configuration where one Al2O3: C chip of a pair is enclosed in a beta-thin light-tight package (which would allow most of the beta radiation to reach the chip); the other in a beta-thick package (which would absorb most beta radiation, hence leaving the chip to record only gamma radiation). The design of the encapsulation is developed using Monte Carlo simulations, and this approach is also used to investigate the sensitivity of the response to the different beta and gamma contributions from uranium, thorium and potassium sources. (C) 2003 Elsevier Science Ltd. All rights reserved.
    Original languageEnglish
    JournalRadiation Measurements
    Volume37
    Issue number4-5
    Pages (from-to)329-334
    ISSN1350-4487
    DOIs
    Publication statusPublished - 2003
    Event10th International Conference on Luminescence and Electron-Spin Resonance Dating - Reno, United States
    Duration: 24 Jun 200228 Jun 2002

    Conference

    Conference10th International Conference on Luminescence and Electron-Spin Resonance Dating
    CountryUnited States
    CityReno
    Period24/06/200228/06/2002

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