6533b81ffe1ef96bd1277c8e
RESEARCH PRODUCT
Response charactterization of ammonium tartrate solid state pellets for ESR dosimetry with radiotherapeutic photon and electron beams.
Maria BraiV. CaputoV. De CaroLibero Italo GiannolaAntonio BartolottaMaria Cristina D'ocasubject
Materials scienceFree RadicalsBiophysicsElectronsRadiationTartrateBiophysical Phenomenalaw.inventionchemistry.chemical_compoundlawDosimetryHumansRadiology Nuclear Medicine and imagingIrradiationParticle SizeElectron paramagnetic resonanceRadiometryTartratesPhotonsDosimeterRadiological and Ultrasound Technologybusiness.industryRadiotherapy Planning Computer-AssistedRadiochemistryGamma rayElectron Spin Resonance SpectroscopyMicrosphereschemistryAbsorbed doseNuclear medicinebusinessdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2001-01-25 | Physics in medicine and biology |