Abstract
Photostimulable storage phosphors have been used in a wide range of applications including radiation measurements in one- and two-dimensional spaces, called point dosimetry and radiography. In this work, we report that an aluminum nitride (AlN) ceramic plate, which is practically used as a heat sink (SHAPAL®, Tokuyama Corp., Yamaguchi, Japan), shows good optically-stimulated luminescence (OSL) properties with sufficiently large signal and capability for imaging applications, and we have characterized the AlN plate for OSL applications. Upon interaction with X-rays, the sample color turns yellowish, due to a radiation-induced photoabsorption band in the UV-blue range below ~500 nm. After irradiating the sample with X-rays, an intense OSL emission can be observed in the UV (360 nm) spectral region during stimulation by red light. Although our measurement setup is not optimized, dose detection was confirmed as low as ~3 mGy to over 20 Gy. Furthermore, we have successfully demonstrated that the SHAPAL® AlN ceramic plate has great potential to be used as an imaging plate in radiography.
Highlights
Ionizing radiations such as X-rays, gamma-rays, alpha-rays, etc., may be measured using various techniques
We reported that an aluminum nitride (AlN) ceramic plate (SHAPAL®, Tokuyama Corp., Yamaguchi, Japan), which is a commercial product as a heat sink, shows thermally-stimulated luminescence (TSL) properties and it has a good potential to be used as a thermally stimulated luminescent detectors (TLD) dosimeter [19]
In contrast, we have newly discovered that the SHAPAL® AlN ceramic plate exhibits optically-stimulated luminescence (OSL) properties
Summary
Ionizing radiations such as X-rays, gamma-rays, alpha-rays, etc., may be measured using various techniques. One of the common techniques is to use phosphors [1]. Rapid light emission upon the absorption of radiation can be typically used for real-time measurements, and such phosphors are so-called scintillators [2,3,4]. Another type of radiation phosphor can accumulate and store the incident dose information in the form of trapped charges, which can be read out optically or thermally. Such phosphors are commonly referred to as so-called storage phosphors or dosimeters
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