Measurement of fallout radionuclides, 239,240Pu and 137Cs, in soil and creek sediment: Sydney Basin, Australia

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dc.contributor.authorSmith, BSen_AU
dc.contributor.authorChild, DPen_AU
dc.contributor.authorFierro, Den_AU
dc.contributor.authorHarrison, JJen_AU
dc.contributor.authorHeijnis, Hen_AU
dc.contributor.authorHotchkis, MACen_AU
dc.contributor.authorJohansen, MPen_AU
dc.contributor.authorMarx, SKen_AU
dc.contributor.authorPayne, TEen_AU
dc.contributor.authorZawadzki, Aen_AU
dc.date.accessioned2017-06-20T04:04:02Zen_AU
dc.date.available2017-06-20T04:04:02Zen_AU
dc.date.issued2016-01-01en_AU
dc.date.statistics2017-06-06en_AU
dc.description.abstractSoil and sediment samples from the Sydney basin were measured to ascertain fallout radionuclide activity concentrations and atom ratios. Caesium-137 (137Cs) was measured using gamma spectroscopy, and plutonium isotopes (239Pu and 240Pu) were quantified using accelerator mass spectrometry (AMS). Fallout radionuclide activity concentrations were variable ranging from 0.6 to 26.1 Bq/kg for 137Cs and 0.02–0.52 Bq/kg for 239+240Pu. Radionuclides in creek sediment samples were an order of magnitude lower than in soils. 137Cs and 239+240Pu activity concentration in soils were well correlated (r2 = 0.80) although some deviation was observed in samples collected at higher elevations. Soil ratios of 137Cs/239+240Pu (decay corrected to 1/1/2014) ranged from 11.5 to 52.1 (average = 37.0 ± 12.4) and showed more variability than previous studies. 240Pu/239Pu atom ratios ranged from 0.117 to 0.165 with an average of 0.146 (±0.013) and an error weighted mean of 0.138 (±0.001). These ratios are lower than a previously reported ratio for Sydney, and lower than the global average. However, these ratios are similar to those reported for other sites within Australia that are located away from former weapons testing sites and indicate that atom ratio measurements from other parts of the world are unlikely to be applicable to the Australian context. © 2015, Elsevier Ltd.en_AU
dc.identifier.citationSmith, B. S., Child, D. P., Fierro, D., Harrison, J. J., Heijinis, H., Hotchkis, M. A. C., Johansen, M. P., Marx, S., Payne, T. E. & Zawadzki, A. (2016). Measurement of fallout radionuclides, 239,240Pu and 137Cs, in soil and creek sediment: Sydney Basin, Australia. Journal of Environmental Radioactivity, 151(3), 579-586. doi:10.1016/j.jenvrad.2015.06.015en_AU
dc.identifier.govdoc8251en_AU
dc.identifier.issn0265-931Xen_AU
dc.identifier.issue3en_AU
dc.identifier.journaltitleJournal of Environmental Radioactivityen_AU
dc.identifier.pagination579-586en_AU
dc.identifier.urihttps://doi.org/10.1016/j.jenvrad.2015.06.015en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/8740en_AU
dc.identifier.volume151en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectPlutoniumen_AU
dc.subjectFallouten_AU
dc.subjectRadioisotopesen_AU
dc.subjectGamma spectroscopyen_AU
dc.subjectAustraliaen_AU
dc.subjectSoilsen_AU
dc.titleMeasurement of fallout radionuclides, 239,240Pu and 137Cs, in soil and creek sediment: Sydney Basin, Australiaen_AU
dc.typeJournal Articleen_AU
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