Abstract
Reference Standard Dosimeters are used to calibrate radiation environments and routine dosimeters. It can also be used in routine dosimetry applications for radiation processing where higher quality dosimetry measurements are required. Electron Spin Resonance (ESR) is a well-established Reference Standard Dosimetry system in industrial applications of ionising radiation, and its use is also proposed in radiation therapy and accident dosimetry. In the present experimental work, PGA solid state dosimeter (SSD) has been investigated using ESR spectroscopy to study the gamma radiation response of this material and to evaluate its dosimetric characteristics: dose response, room temperature fading, heat treatment effect during post-irradiation storage. Results obtained up to now confirm that PGA seems to be suitable material for ESR dosimetry applications.
Highlights
IntroductionThe ionizing radiation produces electron-hole pairs which individually become trapped at various defect sites (radicalic species) in the polymer structure
The ionizing radiation produces electron-hole pairs which individually become trapped at various defect sites in the polymer structure
Before gamma-irradiation, the Poly Glycolic Acid (PGA) used in this study has small signal at about 348 mT which can be related to impurity in PGA matrix
Summary
The ionizing radiation produces electron-hole pairs which individually become trapped at various defect sites (radicalic species) in the polymer structure. Semiconductors and polymers are examples of materials that have been studied by ESR spectroscopy through the detection of paramagnetic species [1,2,3]. It has been the main experimental technique in understanding the effect of ionizing radiation on polymers. Despite the alanine is accepted as reference standard dosimeter by International Atomic Energy Agency (IAEA), its sensitivity is not high for low doses and it has a very high cost. There are many attempts to characterize a new Reference Standard Dosimeters with better radiation sensitivity to substitute alanine [4,7,8,9,10,11]. The new material should have a stable radical per radiation energy; a sharp linewidth and thermal stability at room temperature
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