Ca_5(PO_4)_3Cl:Prの熱蛍光特性

The thermoluminescence (TL) of Ca_5(PO_4)_3Cl doped with Pr ions has been studied for use as a thermoluminescence dosimeter (TLD) material. The TL glow spectra of Ca_5(PO_4)_3Cl:Pr irradiated with UV ray show a liner relation between TL glow intensity and irradiation time. In the case of X ray irradiation, the TL spectra also show a same relation but show a different shape of spectrum. These results suggest that the TLD consisting of Ca_5(PO_4)_3Cl:Pr may be possible to discriminate between UV and X rays. It was found that with Ca_5(PO_4)_3Cl:Pr, the shape of the TL glow curve for UV radiation is different from that of the TL glow curve for X ray radiation. It seemed interesting to investigate the mixed radiation field, and TL and thermally stimulated exoelectron emission (TSEE) measured simultaneously for X ray irradiation. However, TSEE was not observed

FIBによりGa^+イオンビーム照射されたLiFのTLおよびTSEE

A study on thermoluminescence (TL) and thermally stimulated exoelectron emission (TSEE) has been performed for LiF single crystal irradiated by focused Ga^+ ion beam (FIB). The result indicates that the intensities of TL and TSEE glow spectra depend strongly on the accelerating voltage of FIB. A 40keV beam of Ga^+ ions leads a very intensive peak of TSEE glow around 725K. A beam defining aperture with 300μm size in diameter also leads a more intensive peak of TSEE glow around 640K. The TSEE glow may be attributed to F_A center induced by implantation of Ga^+ ions

フェムト秒レーザ照射されたCaF_2のTLおよびTSEE

A study on thermoluminescence (TL) and thermally stimulated exoelectron emission (TSEE) has been performed for CaF_2 single crystal irradiated by a femtosecond (fs) near-infrared laser. Focused laser pulses with approximately 250 fs duration and with a wavelength of 780 nm have been used to excite the electrons of CaF_2 sample. The result indicates that the intensities of TL and TSEE glow spectra depend on the fs laser beam energy. The CaF_2 sample irradiated with non-thermal processing also shows a TL glow spectrum although the peak intensities are weaker than in the case of thermal processing. It may be suggested that TL glow is attributed to trapped electrons in defects of the CaF_2 crystalline witch is excited by multiphoton absorption and/or multiple-stage reaction