Positron-induced Radiophotoluminescence in Ag-doped Glasses

Abstract

Positron annihilation spectroscopy (PAS) is used for the quantification of cavities in a matrix. Although PAS is sometimes considered a nondestructive measurement method, it is worth investigating the interaction of positrons with the matrix during PAS. Here, we have demonstrated that defects are generated in silver-doped phosphate glasses during positron annihilation measurement and that radiophotoluminescence (RPL) is observed after irradiation. There is a linear correlation between the irradiation duration and the observed RPL intensity of the glasses. We observed RPL after a high irradiation dose even after conventional thermal annealing at 360 °C for 1 h. The formation of Ag 2+ species detectable by electron spin resonance (ESR) was confirmed. From the concentration of ESR-active Ag 2+ and Ag 2 + species, it is expected that approximately 0.1% of Ag + cations were changed after 5 days of positron irradiation.

Fundamental aspects, recent progress and future prospects of inorganic scintillators

“…136) This composition with 6 Li enrichment is called GS20, and it has been used in many kinds of neutron detection applications until now. [137][138][139] If we open a search range for storage phosphor-based dosimeters, only Ag-doped phosphate glass (0.09Ag 2 O-27.73Na 2 O-13.14Al 2 O 3 -59.04P 2 O 5 ) 140,141 for radiophotoluminescence (RPL) dosimetry 140) is commercialized. In spite of a close infinite degree of chemical composition freedom, the disadvantage of glass, up to now is a low scintillation light yield.…”

Analysis of Photoluminescence and Dosimetric Properties of (Ce, Tb)-codoped Magnesium Orthosilicate Single Crystals

“…(5) Currently there are no ideal storage phosphors that have all the above features; therefore, many researchers have continued to develop storage phosphors to improve their properties. (6)(7)(8)(9)(10)(11)(12) Magnesium orthosilicate (Mg 2 SiO 4 ) is a well-known host material of inorganic phosphors because of its stable crystal structure, high physical and chemical stability, and low thermal expansion property. (13) Mg 2 SiO 4 is also a well-known material for storing phosphors for personal dosimetry because Z eff of Mg 2 SiO 4 (11.4) is relatively close to that of human soft tissues.…”

Annealing Temperature Dependence of Scintillation Properties of Ga-doped ZnO Translucent Ceramics

“…Various types of scintillators and dosimetric materials have been developed and are still being intensively studied. These materials include sintered ceramics, (8,9) glasses, (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) single crystals, (21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37) and organic materials (38) .…”