水口 和野

Thermoluminescence (TL) and thermally stimulated exoelectron emission (TSEE) in calcium phosphate doped with rare earth ions, such as Dy or Tm, have been studied, because its effective atomic number is close to that of human bones and teeth. It is found that Ca-3(PO4)(2) doped activators show the TL and TSEE sensitivity to both X ray and UV radiation. When the phosphate is irradiated by X rays, four TL glow peaks appear in the temperature regions about 343 K, 388 K, 548 K and 618 K and the TSEE peaks are found at about 343 K, 398 K, 548 K and 618 K. The TSEE peaks seem to correspond to the TL peaks. On the other hand, in the phosphate irradiated by UV, the TL glow is a broad one and appears from 323 K to 423 K, and the TSEE peak appears at about 373 K. The intensity of 548 K TSEE peak is strong and this peak may be useful as a dosemeter.

Thermoluminescence (TL) and thermally stimulated exoelectron emission (TSEE) in calcium phosphate doped with rare earth ions, such as Dy or Tm, have been studied, because its effective atomic number is close to that of human bones and teeth. It is found that Ca-3(PO4)(2) doped activators show the TL and TSEE sensitivity to both X ray and UV radiation. When the phosphate is irradiated by X rays, four TL glow peaks appear in the temperature regions about 343 K, 388 K, 548 K and 618 K and the TSEE peaks are found at about 343 K, 398 K, 548 K and 618 K. The TSEE peaks seem to correspond to the TL peaks. On the other hand, in the phosphate irradiated by UV, the TL glow is a broad one and appears from 323 K to 423 K, and the TSEE peak appears at about 373 K. The intensity of 548 K TSEE peak is strong and this peak may be useful as a dosemeter.