Abstract
Electron spin resonance (ESR) spectroscopy was used to investigate the dosimetric properties of chicken egg shells. The ESR spectra of the irradiated egg shell were found to have an asymmetric absorption characterized by a major resonance at g ⊥=2.0019 and a minor resonance at g ||=1.9980. The study was carried out on g ⊥=2.0019 signal because of the accuracy of measurements and the possibility of using it as ESR dosimeter. The activation energy ( E), frequency factor ( k 0) and mean-life ( τ) were calculated to be 1.50±0.10 eV, 2×10 13 s −1 and (4.4±0.4)×10 4 year respectively. Dose–response was investigated between dose ranges of 1 Gy and 10 kGy for 60Co γ-rays. Dose–response was found to be appropriate for dosimetry in the range 3 Gy to 10 kGy. The lower limit of observable doses for egg shell sample was about 3 Gy. The other ESR dosimetric parameters of egg shell samples, fading characteristic, light effect, dose-rate dependence and energy dependence, have also been studied in detail. Apart from its non-tissue equivalence, egg shell has very good dosimetric properties with insignificant fading, light independence, linearity in dose–response (3 Gy–10 kGy), dose-rate independence and independence from energy above 500 keV. It suggests that egg shell may be used as a retrospective γ radiation dosimetry after nuclear accidents or other short accidental radiation events.
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