Dosimeter properties of AlN

2016

J. Ceram. Soc. Japan

Self Cite

We have investigated the photoluminescence (PL), scintillation and thermally-stimulated luminescence (TSL) dosimeter properties of MgO transparent ceramics doped with different concentrations of Mn 2+ ion (0.001, 0.01, 0.1 and 1%). The samples were synthesized by a Spark Plasma Sintering (SPS) technique. All the samples show a PL band emission around 730 nm, and the intensity increases with the dopant concentration. The PL decay time constants were a few milliseconds which is on the typical order for Mn 2+ ion. In contrast, the scintillation spectrum under X-rays shows additional emissions at 340, 620 and 760 nm. After the samples are irradiated by X-rays, the TSL is observed with a main glow peak appearing around 140°C. The TSL response is linearly related to the irradiation dose at least over the dose range from 0.1 to 1000 mGy.

Section: Methodsmentioning

confidence: 99%

Optical, scintillation and dosimeter properties of MgO transparent ceramic doped with Mn2+

Kato

Okada

2016

J. Ceram. Soc. Japan

Self Cite

“…The TSL glow curve was measured using a TSL reader (TL-2000, NanoGray) 11) over the temperature range of 50 490°C at a constant heating rate of 1°C/s.…”

Section: Methodsmentioning

confidence: 99%

Radioluminescence and thermally-stimulated luminescence of SiO2 glasses prepared by spark plasma sintering

Okada

Kasap

2016

J. Ceram. Soc. Japan

Self Cite

Bulk SiO 2 glasses have been prepared by spark plasma sintering and characterized towards dosimeter applications. The temperature dependence studies of radioluminescence suggest that there are two possible groups of luminescent centres, which show emissions at 385 and 511 nm. At room temperature, the former emission is predominant while the latter emission significantly increases at low temperatures, especially below 200 K. The origins of these emissions are attributed to a pair of silylene centres and dioxasilirane and silylene, respectively. After irradiating the sample, thermally-stimulated luminescence (TSL) is observed around 160°C and above 300°C, in which the emission is mainly the 385 nm component. The TSL intensity is linearly proportional to the radiation dose delivered, and a linear dynamic range has been demonstrated over 10 0 10 4 mGy.

“…The detailed descriptions of the TSL evaluations can be found in our previous work. (15) The irradiation dose was varied from 0.01 to 10…”

Section: Methodsmentioning

confidence: 99%

Scintillation and Dosimeter Properties of LiAlSi2O6 and LiAlSi4O10 Crystals

Fujimoto

Koshimizu

et al. 2017

Sensors and Materials

Optical, scintillation, optically stimulated luminescence, and thermally stimulated luminescence properties of nondoped LiAlSi 2 O 6 and LiAlSi 4 O 10 mineral crystals were investigated. The photoluminescence emission wavelengths of LiAlSi 2 O 6 and LiAlSi 4 O 10 were 300-500 and 350-600 nm, respectively, and the scintillation emission wavelengths were similar. Under vacuum ultraviolet photon excitation at a synchrotron facility (UVSOR), excitation bands of LiAlSi 2 O 6 and LiAlSi 4 O 10 appeared at around 150 and 180 nm, respectively. The decay lifetime of LiAlSi 2 O 6 was on the nanosecond order while that of LiAlSi 4 O 10 was on the millisecond order for both photoluminescence and scintillation. Both samples showed thermally stimulated luminescence, and LiAlSi 4 O 10 had a higher sensitivity. When we investigated optically stimulated luminescence, LiAlSi 4 O 10 exhibited a detectable signal, while we could not observe a signal in LiAlSi 2 O 6 .