The emission spectrum of LiF (TLD-100) at low and high exposures

DeWerd, Larry A.; Stoebe, T. G.

doi:10.1088/0031-9155/17/2/003

Cited by 14 publications

(4 citation statements)

References 3 publications

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“…3 ) ; the smallest variations we were able to detect were about 5 nm. No effect from high doses was noticed up to 2 Mrad; this was experimentally proved by DeWerd and Stoebe (1972) and our results agree. Other colour film was successfully tested; the only shortcoming of our method is a lower sensitivity in the ultraviolet as well as in the blue region.…”

supporting

confidence: 87%

A method for estimation of thermoluminescence emission spectra

Spurný¹,

Hruška²

1976

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supporting

confidence: 87%

A method for estimation of thermoluminescence emission spectra

Spurný¹,

Hruška²

1976

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“…There is extensive evidence illustrating the dependence of supralinearity on impurity composition in LiF and other TL materials. Jasinska et a1 (1969) described LiF:Cu,Ag with f ( D ) = 1 up to lo3 Gy and DeWerd and Stoebe (1971) showed that the incorporation of OH-radicals can eliminate supralinearity in LiF-TLD. At the other extreme, Burgkhardt et a1 (1978b) describe a LiF:Na,Mg TLD with f(D),,,=6…”

Section: Dependence Of F(d) On Impurity Compositionmentioning

confidence: 99%

The theoretical and microdosimetric basis of thermoluminescence and applications to dosimetry

Horowitz

1981

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157

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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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“…The main peak, which is used for dosimetry, occurs at about 200 "C and is numbered + Present address: Health Physics Division, Bhabha Atomic Research Centre, Bombay, India, 0022-3727/86/091791 + 17 $02.50 @ 1986 The Institute of Physics 5 , almost universally. The main emission from all the peaks is a broad band with a maximum at -420 nm (Dewerd and Stoebe 1972). However, some variations (Fairchild eta1 1978, Townsend etal 1983 and additional bands have been observed in the emission spectrum (Crittenden er a1 1974a, Wintersgill etal 1977.…”

Section: Introductionmentioning

confidence: 95%

Thermoluminescence mechanism in LiF (TLD-100) from 90 to 300K

Jain

1986

J. Phys. D: Appl. Phys.

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The thermoluminescence (TL) of LiF (TLD-100) has been studied over the temperature range 90 to 300K. A total of nine glow peaks are observed in this temperature interval. The most intense peak is the one at 137K. Besides this, three other peaks at 149, 254 and 275K are well resolved and their growth with exposure could be followed. No supralinearity could be found in the response of any of these peaks. Similarly, a sensitisation effect is also not observed for any of the glow peaks. Emission spectra were recorded at several temperatures and found to be changing. Up to about 150K, three bands at approximately 250, approximately 305 and approximately 420 nm were observed. The 250 nm band then gradually disappeared and the 420 nm band gained in prominence. At temperatures above about 200K, the emission spectrum contained only the 420 nm band. Phototransferred TL (PTTL) could be obtained in samples irradiated at 90K, warmed up to 300K and then subjected to 254 nm light. The PTTL glow curve showed the repopulation of only two peaks, namely at 149 and at 275K. The emission spectrum of the 149K PTTL peak consists of two bands at approximately 315 and approximately 440 nm and that of the 275K peak only one band at approximately 450 nm. These observations show that the simultaneous recombination of modified VK mobile holes at two different sites is indicated and their recombination should result in 305/315 nm and 420/440 nm emissions. Optical repopulation studies further show that the two strongest low-temperature peaks have a distinctly different behaviour and may be associated with holes.

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The emission spectrum of LiF (TLD-100) at low and high exposures

Cited by 14 publications

References 3 publications

A method for estimation of thermoluminescence emission spectra

A method for estimation of thermoluminescence emission spectra

The theoretical and microdosimetric basis of thermoluminescence and applications to dosimetry

Thermoluminescence mechanism in LiF (TLD-100) from 90 to 300K

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