Characterisation of LiF:Cu,Mg,P (GR-200) for personnel thermoluminescence dosimetry

Y. S. Horowitz, A. Horowitz

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

We report the results of our dosimetric characterisation of hot-pressed GR-200 LiF:Cu,Mg,P chips for personnel radiation protection. The TL sensitivity was studied as a function of the maximum temperature of glow curve readout and heating rate. In order to achieve acceptable re-usability we recommend a maximum temperature of 240 ± 2°C or alternatively 235 ± 5°C, although the latter choice will lead to a significantly higher residual signal. The TL sensitivity is not a function of glow curve heating rate. We have also studied the dependence of the residual TL signal (T(max) = 240 ± 2°C) on a large number of experimental and radiation field parameters. Our main conclusion is that the ratio of the second and subsequent readouts to first readout is, to a good approximation, independent of all parameters except for T(max) and its duration, LET and possibly the time between readouts. The dependence on LET arises from the preferential population of the high temperature peak at 270°C in alpha particle and neutron irradiation. The use of 'unannealed' LiF:Cu,Mg,P individually calibrated dosemeters is thus possible in personnel dosimetry applications if the prior irradiation history of the dosemeters is permanently recorded and the proper corrections (of the order of 10%) are applied. This represents a serious shortcoming of the currently available dosemeters for personnel dosimetry applications.

Original languageEnglish
Pages (from-to)279-282
Number of pages4
JournalRadiation Protection Dosimetry
Volume33
Issue number1-4
DOIs
StatePublished - 1 Jan 1990

ASJC Scopus subject areas

  • Radiation
  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging
  • Public Health, Environmental and Occupational Health

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