A new high sensitivity thermoluminescent phosphor with low residual signal and good stability to heat treatment: LiF:Mg,Cu,Na,Si.
The preliminary investigations are reported on the characteristics of a new, high-sensitivity thermoluminescence phosphor material (LiF:Mg,Cu,Na,Si) prepared in this laboratory. The main dosimetric peak of this phosphor occurs at 197 degrees C at a heating rate of 1 degrees C.s(-1). The glow curve shape shows minimal differences and sensitivity remains stable when annealed in the range from 250 to 280 degrees C for 10 min. Its TL sensitivity to gamma radiation is about 30 times higher than that of TLD-100 with a residual signal 0.2% following a 260 degrees C readout at a heating rate of 15 degrees C.s(-1). This negligible residual signal renders LiF:Mg,Cu,Na,Si usable in unannealed form. Its TL response at both 260 degrees C and 280 degrees C are reproducible within a coefficient of variation of 2% over ten re-use cycles without systematic decrease. It retains the main advantages of LiF:Mg,Cu,P phosphor, and has a lower residual signal and a better stability to heat treatment.
Tang
K
K
Solid Dosimetric Detector and Method Laboratory, Beijing, PR China. Tang@ChinaDML.com
Zhu
H
H
Shen
W
W
Liu
B
B
D003300:Copper / Q000737:chemistry; D005459:Fluorides / Q000737:chemistry / Q000528:radiation effects*; D006358:Hot Temperature; D018020:Lithium Compounds / Q000737:chemistry / Q000528:radiation effects*; D008163:Luminescent Measurements; D008274:Magnesium / Q000737:chemistry; D011854:Radiochemistry; D012680:Sensitivity and Specificity; D012825:Silicon / Q000737:chemistry; D012964:Sodium / Q000737:chemistry; D013819:Thermoluminescent Dosimetry / Q000379:methods* / Q000706:statistics & numerical data
D018020:Lithium Compounds; C027651:lithium fluoride; D003300:Copper; D012964:Sodium; D008274:Magnesium; D005459:Fluorides; D012825:Silicon