LiF:Mg,Cu,P glow curve shape dependence on heating rate

Abstract

The glow curve shape of LiF:Mg,Cu,P (MCP) material is studied in this research. The study is focused on the effects of the heating rate on the dosimetric peaks. Different configurations of dosemeters (chips, cards and powder) are studied. The shifting of the dominant dosimetric peak is observed and analysed. The curves are deconvoluted using the new Harshaw Glow Curve Analyser (GCA) program. Results of the study are presented, as well as possible explanations as to the observed effects.

TL glow curve shape and response of LiF:Mg,Cu,Si—Effect of heating rate

“…Table 1 shows the shifts in the temperatures of glow peaks with increasing heating rates. These were considered qualitatively similar to those reported by Luo et al (2006) and Stadtmann et al (2006) for LiF:Mg,Cu,P. For the 0.8 mm thick TLD pellets, the sample to sample variation in the peak temperature (not in the TL response) increased with heating rate due to the contact heating.…”

“…1 shows typical glow curves of 0.8 mm thick LiF:Mg, Cu,Si pellets recorded 30 min after the irradiation by 90 Sr-90 Y beta rays by using heating rates of 1, 10 and 30 • C s −1 . The glow curve structure is similar to that of LiF:Mg,Cu,P (Luo et al, 2006). At a heating rate of 1 • C s −1 , there are three well separated glow peaks at 105, 154 and 205 • C. To keep the nomenclature the same as that normally used for LiF:Mg,Cu,P, these peaks for LiF:Mg,Cu,Si were denoted in an ascending order of the temperature as peaks 2, 3 and 4.…”

“…Recently, a study (Luo et al, 2006) on glow curve shape dependence on heating rate demonstrated that in LiF:Mg,Cu,P the total TL of combined glow peaks remains unchanged with the increasing heating rate whereas the response of its main dosimetric glow peak (peak 4) decreases and the response of its preceding lower temperature peak (peak 3) increases, apparently compensating for the decrease in peak 4. In view of this, it became important to investigate the shape of the glow curve and the impact of the low temperature glow peaks on the response of the main dosimetric glow peak of LiF:Mg,Cu,Si.…”

Effect of Heating Rate on the Responses of LiF: Mg, Cu, Na, Si Thermoluminescent Phosphor

“…Pradhan [3] reported that the glow-peak areas of LiF TLD-700 ribbons and LiF:Mg,Cu,P increase for the heating rates in the range from 1 K/s to 20 K/s. Meanwhile Luo et al [9] reported that peaks 3+4 in LiF:Mg,Cu,P remain almost unchanged at 90% of the total integral. Recently Pradhan et al [10] reported that in LiF:Mg,Cu,Si the main glow peak did not exhibit any significant reduction with increasing heating rate in the range from 1 to 30 K/s.…”

“…However, the TL response strongly depends on heating rate, an important parameter in the TL measurements. Influence of the heating rate on TL glow curve has been the object of study by different authors [1][2][3][4][5][6][7][8][9][10].…”