Application of whole-body personal TL dosemeters in mixed field beta-gamma radiation

Abstract

Application of whole-body personal TL dosemeters based on a high-sensitivity LiF:Mg,Cu,P (MCP-N) in mixed field beta-gamma radiation has been characterised. The measurements were carried out with (90)Sr/(90)Y, (85)Kr and (137)Cs point sources to calculate the energy response and linearity of the TLD response in a dose range of 0.1-30 mSv. From the result, calibration curves were obtained, enabling the readout of individual dose equivalent Hp(10) from gamma radiation and Hp(0.07) from beta radiation in mixed field beta-gamma. Limitation of the methodology and its application are presented and discussed.

Application of Bayesian statistics for radiation dose assessment in mixed beta-gamma fields

“…At the moment, to the best of the authors’ knowledge, there are no studies that would solve the problem of unknown θ or k x parameters for dose estimation, as well as those that would use the Bayesian or Monte Carlo approaches in beta-gamma mixed fields. So far, doses are assessed directly, most often using different types of passive dosimeters such asTLDs and optically stimulated luminescence dosimeters (Delgado 2000 ; Chase and Hirning 2008 ; Ciupek et al 2014 ; Carinou et al 2015 ; Brame and Groer 2003 ), scintillators or ionization chambers (Swinth and Sisk 1991 ).…”

“…TLDs are small and cheap and have a linear dose–response up to about 50 Sv. Their advantage is that they can be used in mixed beta-gamma fields (Chase and Hirning 2008 ; Ciupek et al 2014 ): using different shielding (filters) of TLD pellets provides accurate results in routine dosimetry. Such filters are used to distinguish and often identify between the different components of a mixed radiation field.…”