title: Pion dosimetry with thermoluminescent materials.
abstract: Various thermoluminescent materials (6LiF, 7LiF, Li2B4O7:Mn, CaSO4:Dy, CaF2:Mn, CaF2-Dy, CaF2:Tm) were irradiated with pi- mesons throughout the depth dose distribution of a beam with central momentum of 176 MeV/c. Doses from 0.05 to 2 Gy were used and linearity and reproducibility were investigated. For LiF, CaF2:Dy and CaF2:Tm, low- and high-temperature peaks were analysed separately. CaF2:Tm was found to be the most suitable for pi- dosimetry since the total dose and the high LET component could be determined using the integral TL signal and the peak height ratio of the 150 degrees C and 240 degrees C peaks. In the dose range used, both peak responses are linear with dose and the sensitivity of the materials is 10 times that of LiF. The reproducibility was +/- 3%. The high temperature peak of 7LiF is too small to be determined accurately and the high temperature peak of CaF2:Dy decreases with increasing LET in the same way was the low temperature peak does, so that no LET information can be extracted.
mesh_terms: D002124:Calcium Fluoride; D004601:Elementary Particles; D004735:Energy Transfer; D005459:Fluorides; D008094:Lithium; D018020:Lithium Compounds; D013819:Thermoluminescent Dosimetry / Q000379:methods*
chemical_list: D018020:Lithium Compounds; C027651:lithium fluoride; D008094:Lithium; D002124:Calcium Fluoride; D005459:Fluorides