Strategy for finding new materials for ESR dosimeters

Ikeya, Motoji; Hassan, G.M.; Sasaoka, Hideki; Kinoshita, Yukinori; Takaki, Satoshi; Yamanaka, Chihiro

doi:10.1016/s0969-8043(00)00073-7

Cited by 58 publications

(17 citation statements)

References 9 publications

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“…[1,2] For high radiation dose L-α-alanine has been successfully applied. Efforts to measure lower doses have been made, and a dose range of 1 -10 5 Gy for the alanine dosimeter has been reported [3].…”

Section: Introductionmentioning

confidence: 99%

Ammonium dithionate—A new material for highly sensitive EPR dosimetry

Danilczuk

Gustafsson

Sastry

et al. 2008

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Polycrystalline ammonium dithionate has been examined for its radiation response in the low dose range (< 5 Gy) using EPR technique. The-radical ion was detected as a single EPR line with a peak-to-peak derivative width of ca. 0.44 mT in irradiated samples and its intensity was found to vary linearly with dose. At equal and moderate settings of microwave power and modulation amplitude ammonium dithionate was at least 7 times more sensitive than L-alanine which is the most common EPR dosimeter standard. Pulse experiments were performed on the powder samples to obtain the longitudinal relaxation time. These and microwave saturation experiments served to indicate the optimal microwave power to be applied during measurements as an EPR dosimeter for best sensitivity of this material. It is thus claimed that ammonium dithionate has excellent potential to become an EPR dosimeter with a low limit of the measurable dose for cases where tissue equivalence is not required or can be corrected for.3

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Section: Introductionmentioning

confidence: 99%

Ammonium dithionate—A new material for highly sensitive EPR dosimetry

Danilczuk

Gustafsson

Sastry

et al. 2008

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…7 Variations of the measured intensity I 3 (filled triangle monohydrate CA and filled inverted triangle anhydrous CA) and spectrum area (filled circle monohydrate CA and filled square anhydrous CA) with applied radiation dose. Symbols experimental, lines calculated data using exponential and linear function for the intensities (dashed lines) and spectrum areas (solid lines), respectively lines, sharp spectral lines, stable radical at RT [21,22] and simple ESR spectra. In addition, its dosimetric features should be comparable with alanine.…”

Section: Discussionmentioning

confidence: 99%

Investigation of Kinetic and Dosimetric Features of Citric Acid Using ESR Spectroscopy

Tuner

2012

Appl Magn Reson

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In the present work, dosimetric potential and temperature-dependent behaviors of the radicals produced upon c-irradiation of anhydrous and monohydrate citric acid were explored through a detail electron spin resonance (ESR) study. While unirradiated samples presented no ESR signal, irradiated samples were observed to exhibit an ESR spectrum consisting of many intense and weak resonance lines spread over a magnetic field range about 13 mT and centered at g = 2.0032. Although, the radicals produced upon c-irradiation have the same structures, the ESR spectra of both compounds of citric acid were observed to be different. An evaluation technique based on the variations of the characteristic resonance lines and the spectrum area was adopted to assign the radical species responsible for the observed experimental ESR spectrum and to determine their kinetic and dosimetric features.

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“…radiation therapy. While there were attempts to improve the sensitivity of alanine, there were also efforts to find new materials suitable for measuring radiotherapy doses [41].…”

Section: Introductionmentioning

confidence: 99%