小型ｘ線発生装置を搭載した蓄積放射線線量評価用ルミネセンス自動測定システムの開発

Hashimoto, Takeji; Nakagawa, Takahiro; Usuda, Hayato; Yawata, Takashi

doi:10.2116/bunsekikagaku.51.625

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…To achieve this improvement, a special heater was designed; the heater part was composed of four ceramics heaters, with heating limited to the head parts, in a bronze capsule cover. Only the 10 mm-diameter tabletop part of the bronze capsule directly faces the PMT (Hashimoto et al, 2002a(Hashimoto et al, , 2002b. In combination, these strategies reduced the total background to 2×10 4 counts per second in the 350-380°C region of the glow curve, corresponding to approximately one fifth of the best result achieved by Fattahi and Stokes (2000b).…”

Section: Ceramics Heater Assembly and Light Guidementioning

confidence: 99%

“…The author's group were the first to propose the preferred use of a small X-ray generator (Varian VF-50J) instead of a 90 Sr-90 Y β-source as the standard radiation source, because of the following advantages; (i) a close linearity between tube currents and X-ray dose-rates, (ii) a wide dynamic range of applicable dose rates, (iii) a highly uniform irradiation property to the sample area, and (iv) the possibility of controlling the applied tubevoltages and currents with a computer program (Hashimoto et al, 2002a(Hashimoto et al, , 2002bAndersen et al, 2003;BoetterJensen et al, 2003).…”

Section: Small X-ray Generatormentioning

confidence: 99%

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An Overview of Red-Thermoluminescence (RTL) Studies on Heated Quartz and RTL Application to Dosimetry and Dating

Hashimoto¹

2008

Geochronometria

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Abstract:The RTL-phenomena in quartz grains were initially reported and their properties and applications were developed by our group. Although RTL-measurements had the difficulty of overcoming high background counts due to blackbody radiation, the excellent dose linearity and hard-tobleaching nature of quartz RTL are suitable for accurate retrospective dosimetry and dating of burnt archaeological materials. In his paper, the discovery of RTL-phenomena is described. Subsequently, the construction and features of an automatic luminescence measuring system are mentioned together with innovative methods of decreasing the background level for the RTL measurement. Practical applications to dosimetry and dating are then described from the viewpoints of the preferable nature of RTL in comparison to other luminescence observations. Finally, some recent advances in RTL research are presented based on their emission mechanism correlated with impurity contents.

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Section: Ceramics Heater Assembly and Light Guidementioning

confidence: 99%

Section: Small X-ray Generatormentioning

confidence: 99%

An Overview of Red-Thermoluminescence (RTL) Studies on Heated Quartz and RTL Application to Dosimetry and Dating

Hashimoto¹

2008

Geochronometria

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Usability of VTL from natural quartz grains for retrospective dosimetry

Fujita¹,

Hashimoto²

2006

Radiation Protection Dosimetry

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To develop retrospective dosimetry of unexpected radiation accident, basic studies on violet thermoluminescence (VTL) phenomena were conducted using natural quartz grains. All VTL glowcurves of as-received samples did not exhibit peaks <250 degrees C, although for artificially irradiated quartz samples there were VTL peaks in the temperature region <250 degrees C. Therefore, accident doses could be estimated without the interference of naturally accumulated doses by VTL measurements from natural quartz. The mean lives of VTL were evaluated by the various heating rates method and the range of values was found to be between some days and ten thousands of years depending on each peak. Especially, the mean life of VTL peak at 200 degrees C was years order. Furthermore, the lower detection limit was calculated to be tens of mGy from the response curve. This value was lower than that of other methods such as ESR dosimetry. From these results, we conclude that VTL dosimetry can be preferred for accidental evaluation.

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