caa a22 4500 397503091 CHVBK 20180308164537.0 cr unu---uuuuu 161202e19950101xx s 000 0 eng 10.1093/oxfordjournals.rpd.a082591 doi 0144-8420 pii (NATIONALLICENCE)oxford-10.1093/oxfordjournals.rpd.a082591 Electron Paramagnetic Resonance Spectra of Irradiated Finger-nails: A Possible Measure of Accidental Exposure [Elektronische Daten] [M.C.R. Symons, H. Chandra, J.L. Wyatt] Electron paramagnetic resonance (EPR) spectroscopy is a significant technique in both dating and dosimetry. Radicals, formed by ionising radiation, are trapped within rigid solids (bone or tooth enamel) and have 'infinite' life-times. These are of use in dating materials provided saturation has not been reached. However radicals in fingernails decay over a period of a few weeks. Hence nails have been dismissed as method of dating. Our aim is to suggest that in human accidents, where hand exposure is suspected, nail parings might be useful and convenient. The radicals give an EPR singlet which decays at ambient temperature (half-life about 300 h). No decay is observed below 200 K, and hence nail parings taken shortly after exposure can be stored for long periods. Such nails are exposed to a range of doses, and the decay of the resulting signal is then studied. There is always a background signal, but this can be estimated after decay of the radiation induced signal and hence by extrapolation the unknown initial dose can be estimated. Preliminary results show that doses (2Gy can be estimated. Radiation Protection Dosimetry Symons M.C.R. aut Chandra H. aut Wyatt J.L. aut Radiation Protection Dosimetry Oxford University Press 58/1(1995-01-01), 11-15 0144-8420 58:1<11 1995 58 rpd https://doi.org/10.1093/oxfordjournals.rpd.a082591 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/oxfordjournals.rpd.a082591 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Symons M.C.R. aut NATIONALLICENCE 700 1- Chandra H. aut NATIONALLICENCE 700 1- Wyatt J.L. aut NATIONALLICENCE 773 0- Radiation Protection Dosimetry Oxford University Press 58/1(1995-01-01), 11-15 0144-8420 58:1<11 1995 58 rpd Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford