Radiation effects on alanine; thermal approach for estimation of low absorbed radiation doses

Varshney, Lalit; Choughule, S.V.

doi:10.1016/s0969-806x(98)00267-9

Cited by 6 publications

(2 citation statements)

References 6 publications

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“…Improvements in ESR dosimetry could be obtained by either optimizing data acquisition and using a high resolution in analysis procedures (Coppola et al 1999, Nette et al 1993, Rakvin 1996, Varshney and Choughule 1999 or by substituting alanine with other substances (Azorín et al 2000, Hassan et al 1998, Olsson et al 1999, Yavuz and Köksal 1999.…”

Section: Introductionmentioning

confidence: 99%

Response characterization of ammonium tartrate solid state pellets for ESR dosimetry with radiotherapeutic photon and electron beams

et al. 2001

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Solid state pellets (1 mm thick) for electron spin resonance (ESR) dosimetry were made using ammonium tartrate as the radiation-sensitive substance. Their behaviour was experimentally investigated as a function of dose with 60Co gamma rays. The calibration function obtained permits measurements of absorbed dose in the 2-50 Gy range, with a combined uncertainty of +/-4%. The lowest detectable dose was about 0.5 Gy. These properties are comparable with or even better than those of ESR dosimeters made from other materials. The time stability of the ESR signal of ammonium tartrate dosimeters at different storage conditions after irradiation was studied. A rather complex behaviour was observed, which suggests that more species of free radicals are produced by radiation and that migration processes may be effective. No dependence of the response on beam quality was found for high-energy photon and electron beams produced by a linear accelerator used in radiotherapy, whereas dose was underestimated with low-energy x-rays.

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Section: Introductionmentioning

confidence: 99%

Response characterization of ammonium tartrate solid state pellets for ESR dosimetry with radiotherapeutic photon and electron beams

et al. 2001

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“…During the isothermal heating, it decomposes and partially restore R 1 radical. 20 In order to study the kinetics of the thermal disappearance of radicals, we tried to fit our data in integral equations, used in chemical kinetics. It was observed that linear plots are obtained, for all six temperatures only when the ratio [Is/Io] is expressed as a function of the time of isothermal heating (Is denotes the intensity of the signal at the moment t, while Io is the initial intensity).…”

Section: Resultsmentioning

confidence: 99%

Comparative EPR study of the radical species formed during the radiolysis in polycrystalline solid state of monohydrated (L-ASN.H2O) and deuterated asparagine (L-ASN.D2O)

Neacşu¹,

Gheorghe²

2022

PPIJ

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L-asparagine monohydrate (L-Asn•H 2 O) and L-asparagine deuterated (L-Asn•D 2 O), gamma irradiated were investigated in polycrystalline state, by means of the EPR spectroscopy. The recorded spectra of L-Asn•H 2 O are due to the overlapping radicals spectra, having the structures R 1 , R 2 and R 3 in various ratios. The water participation at the radiolysis mechanism via the H and OH radicals formed by ionizing radiations was highlighted. The kinetic study was performed at temperatures beyond and above dehydration temperature. The high value of the preexponential factor and the positive one of the activation entropy proves that the bonds of the transition complex involving the radicals are weaker after dehydration, the rate of the radical's disappearance reaction being fast. For L-Asn•D 2 O, a different behaviour was found, the recorded spectra are different from L-Asn•H 2 O, due to the increasing energy of the deuterium bonds. The radicalic entities ratio depends on crystalisation time after dissolution in D 2 O.

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Thermal and spectroscopic analysis of florfenicol irradiated in the solid-state

Marciniec

Stawny

Hofman

et al. 2008

J Therm Anal Calorim

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Radiation effects on alanine; thermal approach for estimation of low absorbed radiation doses

Cited by 6 publications

References 6 publications

Response characterization of ammonium tartrate solid state pellets for ESR dosimetry with radiotherapeutic photon and electron beams

Response characterization of ammonium tartrate solid state pellets for ESR dosimetry with radiotherapeutic photon and electron beams

Comparative EPR study of the radical species formed during the radiolysis in polycrystalline solid state of monohydrated (L-ASN.H2O) and deuterated asparagine (L-ASN.D2O)

Thermal and spectroscopic analysis of florfenicol irradiated in the solid-state

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