The LET Dependence of LiF:Mg,Ti Dosemeters and its Application for LET Measurements in Mixed Radiation Fields

Investigation of the ionisation density dependence of the glow curve characteristics of LIF:MG,TI (TLD-100)

“…In both the ST-C and SL-C materials and in agreement with previous studies (12,13) , the behaviour of the HTR for Peak 7 is strongly correlated with ionisation density (LET) increasing in a well-behaved manner to a factor of 20 and 10, respectively, at $20 keV mm 21 for the ST-C and SL-C materials, respectively. The latter value of $10 is also in good agreement with Refs (12,13) which also employ slow but exponential cooling (in the furnace) following the high-temperature anneal. However, at higher values of LET, the results of this study level off and enter into saturation much more rapidly and suggest that hidden variables are very much at play in the relative intensities of the HTTL.…”

“…Various authors (12,13) have promoted the use of the HTTL as an estimator of average LET in space radiation fields due to the enhanced relative intensity of the HTTL at high-ionisation density (HID). This phenomenon was probably documented originally in the early 1980s (14) in the hope that it would be possible to measure both 'low-LET' and 'high-LET' radiation dose simultaneously with one detector.…”

“…Attempts were made to apply the 'two-peak-method' to fast neutron radiation fields in clinical dosimetry (15) , even though it was acknowledged that both Peak 5 and the high-temperature structure are supralinear to both neutrons and gamma rays in the dose region applicable to clinical irradiations. In later applications in space radiation fields (12,13) , essentially the same analysis method was dubbed the 'high-temperature ratio' (HTR) method, in which the ratio of the intensity of the TL light emission in the high-temperature region ($225-3008C) to the light intensity of glow Peak 5 following HID radiation is compared with the same ratio following gamma or electron LID irradiation. Although the technique has been claimed to be highly successful, it has also been criticised (16,17) on various grounds, both technical and theoretical, which are beyond the scope of this paper.…”

Robust determination of effective atomic numbers for electron interactions with TLD-100 and TLD-100H thermoluminescent dosimeters

“…This includes such applications as measurement of out-of-field organ doses in radiotherapy [2], where scattered and leaked radiation dominates and the radiation spectrum differs notably from the primary field. McKeever et al and the references therein provide a good overview of the characteristics of TLD-100 and TLD-100H dosimeters [3], the radiological properties of which are of significant interest [4][5][6][7][8][9][10].…”

LET dependence of thermoluminescent efficiency and peak height ratio of CaF2:Tm

“…Several authors (Schöner et al, 1999;Yasuda, 2001) have proposed to apply this idea to dose equivalent estimation in the complex space radiation environment using an empiric combination of relative TL efficiencies for specific glow peaks and the HTS as a function of LET. The accuracy of these methods is restricted since ions with charges Z > 2 are registered with increasingly lower sensitivity and dose contributions from these ions are consequently underestimated in the integral TL signal.…”