The optical properties of phosphate glass (PG) with two different impurities, namely, aluminum and tin, were investigated. Broad white luminescence was observed from PGs with tin and aluminum impurities under deep ultraviolet exposure. Through emission and excitation spectroscopy and decay curve measurement, it is assumed that the origin of the broadband luminescence differs depending on the impurities introduced. In addition, time-resolved emission spectral analysis revealed the difference in decay constant at each wavelength. The results obtained in this study might give important information about two potential impurities of PG for a better understanding of background noise and the functions of widely used radiophotoluminescence (RPL) dosimeters.

The possibility of real-time monitoring of clinical carbon beams was investigated by analyzing ion beam induced luminescence (IBIL) using phosphate glass (PG) with a dopant of europium (Eu). Phosphate glass with a silver activator (PG: Ag) is known as a substrate for personal dosimeters. Several trials are being made by utilizing PG: Ag as an in-situ diagnostic tool for the clinical radiation therapy field. However, silvers are not actively responding to the radiation during the irradiation because of their build-up effect. In this study, we introduced a co-activator of europium, which is expected to coexist with silvers and have a scintillator property for real-time response. IBIL was successfully visualized with each bunch of 290 MeV/n from synchrotron under different beam intensity from 6.0×106 to 3.0×109 (clinical beam condition) counts/spill. IBIL measurement at each position of Bragg peak suggested that developed PG:Ag-beads with Eu co-activators have successfully demonstrated real-time radiation monitoring of clinical carbon beams.