Thermoluminescent CaF.sub.2 (Tm) and method for its use

Details Thermoluminescent CaF.sub.2 (Tm) and method for its use Thermoluminescent CaF.sub.2 (Tm) and method for its use

1975-01-09

1977-08-02

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

With heating of luminophors

G01T 111

Patent

active

040398340

ABSTRACT:
A method is disclosed for the use of thulium doped calcium fluoride in the form of a thermoluminescent dosimeter to measure the amount of radiation to which the dosimeter has been exposed.
A new thermoluminescent material for use in a dosimeter is also disclosed. The material consists essentially of crystalline calcium fluoride doped with less than 0.5 mole percent thulium. The material has several unique properties, and displays two well separated glow maxima which permit using a lower temperature (150.degree. C) peak as a thermometer to determine a mean ambient temperature for the dosimeter. The mean ambient temperature may then be used to correct thermoluminescent data for a high temperature (250.degree. C) peak.

REFERENCES:
patent: 3141973 (1964-07-01), Heins et al.
patent: 3652854 (1972-03-01), Wheeler
patent: 3761710 (1973-09-01), Yamashita et al.
patent: 3775614 (1973-11-01), Winn et al.
patent: 3786254 (1974-01-01), Yamashita et al.
patent: 3883748 (1975-05-01), Nada et al.

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