Visualization of Radiation Dose Distribution Utilizing Radiophotoluminescence in Glass Dosimeter

Abstract

In the decommissioning of a nuclear power plant, especially for the decontamination of radioactive substances caused by the 2011 Fukushima nuclear power plant accident, which has affected reconstruction after the earthquake, dose evaluation and validation of the decontamination effect are very important. To prepare a novel passive-type dosimeter system, which can be applied to radiation dose monitoring and visualization of the two-dimensional distribution of ionizing radiation in a contaminated area, we tried to develop bead-and sheet-type glass dosimeters utilizing the radiophotoluminescence (RPL) phenomenon in Ag + -doped phosphate glass. It is confirmed that the bead-type glass dosimeter with a diameter of about 50 μm exhibits an intense RPL. It is found that the sheet-type glass dosimeter, which is made of bead-type glasses, is useful for the monitoring of radiation dose in a wide dose range and the visualization of dose distribution.

Radiophotoluminescence Imaging Reader for Passive Dosimetry

“…We previously reported on the measurement of a two-dimensional radiation dose distribution using the RPL phenomenon of Ag-PG phosphor sheets and its readout system. (24) To measure a two-dimensional RPL image using this system, the readout system was mainly composed of an x-y stage (A4 size), a UV LED, and a laptop computer. The image is monitored by scanning the focused UV light on the irradiated sheet-type Ag-PG dosimeter.…”

“…Radiophotoluminescence (RPL) (1) is a phenomenon in which luminescent centers are generated in a phosphor material through interaction with ionizing radiation. The number of luminescent centers produced is proportional to the integrated radiation dose and can generally be read as photoluminescence (PL) intensity.…”

“…Currently, it is widely used in personal dosimetry for daily dose control. (1,2) In a successful RPL material, the generated center is so stable that it is not affected by ambient environmental conditions such as light and temperature, as well as the excitation light during a readout. These properties allow a highly reliable dose measurement, particularly because it allows a signal readout multiple times, which effectively reduces statistical measurement uncertainties and is a distinct advantage over other related techniques using, for example, thermally stimulated luminescence (TSL), (3)(4)(5) optically stimulated luminescence (OSL), (6) and scintillation.…”

“…Given this background, we have been developing flexible dosimeters made of powdered RPL materials dispersed in resin. (23,24) In this paper, we report on the construction and evaluation of a two-dimensional imaging system using the RPL phenomenon for ionizing radiation, which is simple and inexpensive.…”

RPL properties of samarium-doped CaSO4

“…The latter properties allow a highly reliable dose measurement, particularly because it allows a signal readout multiple times which effectively reduces the statistical measurement uncertainties, which is a distinct advantage over other related techniques using, for example, thermally-stimulated luminescence, 2) optically-stimulated luminescence, 3) and scintillation. 4) Despite the aforementioned advantages, there are only a limited number of conventional RPL materials known for radiation dosimetry: Ag-doped phosphate glass, [5][6][7] LiF, 8,9) and Al 2 O 3 :C,Mg. 10,11) Due to the limited number of existing materials, a comprehensive understanding of the RPL phenomenon as well as extending into new applications have not been well developed.…”