A film-thermoluminescent dosimetry method for predicting body doses due to diagnostic radiography

TLproperties of many materials and their interaction with various types of radiation fields.+ The thermoluminescent efficiency, ak, is the ratio of the mean energy emitted as TL light, E+, to the mean energy, E, imparted to the TL material by the radiation field, a k = E+/B. d is sometimes referred to as the 'integral' dose in the irradiated volume and is defined as the expectation value of the imparted energy. $ The relative TL response, q k , , of a TL material of mass m, and volume V, is the ratio of the TL efficiences for the two radiation fields, k, I at 'low dose' Do, i.e. where .E+ is increasing linearly with dose:ak(Do)/ar(Do). 9: A tissue-equivalent material is one with atomic composition which closely approximates to the atomic composition of tissue. TL materials such as LiF, Li2B407, Be0 are nonetheless referred to as approximately 'tissue-equivalent' materials in gamma radiation fields because their effective atomic number and mass energy absorption coefficients for photoelectric absorption approximate to those of tissue (e.g. Jayachandran 1971).Y S Horo w itz irradiated material. Johnson also describes the use of an integrating period in the readout cycle which approximately cancels the growth of peaks 4-5 due to storage by including a certain fraction of peaks 2-3 which exhibit stronger fading. Ehrlich (1974) using fast preheating to 160°C did not observe 'sensitivity-transfer' in TLD-700; however, fading increased to 15% after 4 days. Indeed the fading of 'unannealed' LiF-TLDS is strongly dependent on the preheat cycle (Webb and Phykitt 1971, De Planque et a1 1980). Mason et a1 (1976) studied the effect of Ti in TLD-700 ( T1 = 300 "C, tl = 30 min) on the relative trap distributions associated with peaks 2 and 5 and concluded that the results of Booth etal (1972) were inconsistent with their data.'7. '7.' 7.

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A film-thermoluminescent dosimetry method for predicting body doses due to diagnostic radiography

Cited by 3 publications

References 5 publications

Computer Tomography Phantom Applications

Computer Tomography Phantom Applications

Evaluation of the utilization of the supine position in intraoral radiology

The theoretical and microdosimetric basis of thermoluminescence and applications to dosimetry

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