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Precise measurement of the absolute gamma emissions of 223Ra and its decay progeny in equilibrium.

Collins, S M; Pearce, A K; Regan, P H; Keightley, J D (2015) Precise measurement of the absolute gamma emissions of 223Ra and its decay progeny in equilibrium. Appl. Radiat. Isot., 102. pp. 15-28.

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Precise measurements of the absolute -ray emission probabilities have been made of radiochemically pure solutions of 223Ra in equilibrium with its decay progeny, which had been previously standardised by 4p(liquid scintillation)- digital coincidence counting techniques. Two high purity germanium -ray spectrometers were used which had been accurately calibrated using a suite of primary and secondary radioactive standards. Comparison of the activity concentration determined by the primary technique against -ray spectrometry measurements using the nuclear data evaluations of the Decay Data Evaluation Project exhibited a range of ~18% in the most intense -ray emissions (> 1% probability) of the 223Ra decay series. Absolute -ray emission probabilities and standard uncertainties have been determined for the decay of 223Ra, 219Rn, 215Po, 211Pb, 211Bi and 207Tl in equilibrium. The standard uncertainties of the measured -ray emission probabilities quoted in this work show a significant improvement over previously reported -ray emission probabilities. Correlation coefficients for pairs of the measured -ray emission probabilities from the decays of the radionuclides 223Ra, 219Rn and 211Pb have been determined and are presented. The a-transition probabilities of the 223Ra have been deduced from P( +ce) balance using the -ray emission probabilities determined in this work with some agreement observed with the published experimental values of the a-emission probabilities.

Item Type: Article
Keywords: Nuclear Data, 223Ra, 219Rn, 215Po, 211Pb, 207Tl, Gamma-ray emission probabilities, Gamma-ray spectrometry, Correlation coefficients, Radioactivity
Subjects: Ionising Radiation
Ionising Radiation > Radioactivity
Identification number/DOI: 10.1016/j.apradiso.2015.04.008
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/6742

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