Investigation on Thermoluminescence of Al2O3:C and LiF:Mg,Cu,P to Natural Background Radiation

To choose the best thermo luminescent dosimeters (TLDs) for low radiation dose detector, thermo luminescence responses of three kinds of TLDs, Al₂O₃: C and LiF: Mg, Cu, P, were measured, and the natural background radiation in Zhanjiang is used as a low radiation field. The TLDs´ sensitivities were compared, Al₂O₃:C (the threshold dose of is about 1-2μGy) is in some sort more sensitive than LiF:Mg, Cu, P (the threshold dose of is about 2μGy). Temperature of glow peak of Al₂O₃:C is not so high, and the TL would decay after a relatively long period, so the TL dose response curve of Al₂O₃:C is deviation from linearity. Temperatures of glow peaks of LiF:Mg, Cu, P are relatively high, and the TL would hardly decay after a relatively long period, so the TL dose response curves are nearly linearity. In a word, Al₂O₃:C is not the best TLD in low radiation cumulative dose detection, although it is the best optically stimulated luminescence dosimeter (OSLD).