Biota dose modelling: Little Forest Burial Ground scenario

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dc.contributor.authorJohansen, MPen_AU
dc.contributor.authorBarnett, CLen_AU
dc.contributor.authorBeresford, NAen_AU
dc.contributor.authorBrown, JEen_AU
dc.contributor.authorČerne, Men_AU
dc.contributor.authorHoward, BJen_AU
dc.contributor.authorKamboj, Sen_AU
dc.contributor.authorKeum, DKen_AU
dc.contributor.authorPayne, TEen_AU
dc.contributor.authorSmodiš, Ben_AU
dc.contributor.authorTwining, JRen_AU
dc.contributor.authorVandehnove, Hen_AU
dc.contributor.authorVives i Batlle, Jen_AU
dc.contributor.authorWood, MDen_AU
dc.contributor.authorYankovich, TLen_AU
dc.contributor.authorYu, Cen_AU
dc.date.accessioned2024-01-11T04:44:24Zen_AU
dc.date.available2024-01-11T04:44:24Zen_AU
dc.date.issued2012-10-16en_AU
dc.date.statistics2022-02-02en_AU
dc.description.abstractRadiation doses to terrestrial wildlife were examined in a model inter-comparison study on a diverse range of terrestrial plants and animals at the Little Forest Burial Ground, NSW, Australia. This inter-comparison was one in a series conducted under the IAEA Environmental Modelling for Radiation Safety Programme (EMRAS), which indicated general agreement among available biota dose models in the use of dose conversion parameters for standard organisms and geometries. However, notable variation in dose estimates emerged when the models were applied to a terrestrial deposition scenario (Chernobyl exclusion zone, Ukraine); a freshwater aquatic scenario (Perch Lake, Canada; a low-level burial ground scenario (Little Forest Burial Ground, Australia;), as well as additional aquatic (Beaverlodge, Canada) and wetlands (various locations) scenarios currently underway. Given the range in outcomes from the various modelling approaches of the previous EMRAS studies, the Little Forest Burial Ground scenario focused on quantifying the factors causing variation. The dominant variable factor (up to orders of magnitude on mean total dose rates) was the soil-to-organism transfer of radionuclides. Additional variation was associated with: exposure configurations (two orders of magnitude when considering trees growing on the waste trenches); inclusion/exclusion of progeny in Th and U isotopes (typically less than one order of magnitude); and radiation weighting factors and dose conversion coefficients (typically less than one order of magnitude). At Little Forest, results suggest radionuclide uptake is occurring in wildlife, but at low levels as most organisms only access the relatively clean surface soils above the buried wastes. Doses to acacia tree were elevated, however, due to its deeper roots having direct access to the buried wastes, with predictions of 95th percentile doses above the screening levels indicating further study is warranted. Our study confirms and adds to the outcomes of previous EMRAS studies in quantifying the sources of variation in biota dose modelling, and highlights soil to-organism transfer as a key source of uncertainty. It prompts continued evaluation of the underlying mechanisms governing soil-to-organism transfer of radionuclides to improve estimation of dose rates to terrestrial wildlife.en_AU
dc.identifier.citationJohansen, M. P., Barnett, C. L., Beresford, N. A., Brown, J. E., Černe, M., Howard, B. J., Kamboj, S., Keum,. D. K., Payne. T. E., Smodiš, B., Twining, J. R., Vandenhove. H., Vives I Battle, J., Wood, M.D., Yankovich, T. L. & Yu. C. (2012). Biota dose modelling: Little Forest Burial Ground scenario. Paper presented to the 12th South Pacific Environmental Radioactivity Association Conference (SPERA 2012), Tuesday 16 October – Friday 19 October 2012, Sydney, Australia. Lucas Heights, NSW: Australian Nuclear Science and Technology Organisation. (pp. 48-49).en_AU
dc.identifier.conferenceenddate2012-10-19en_AU
dc.identifier.conferencename12th South Pacific Environmental Radioactivity Association Conference (SPERA 2012)en_AU
dc.identifier.conferenceplaceAustralian Nuclear Science and Technology Organisation, Sydney, Australia.en_AU
dc.identifier.conferencestartdate2012-10-16en_AU
dc.identifier.pagination48-49en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15318en_AU
dc.language.isoenen_AU
dc.publisherAustralian Nuclear Science and Technology Organisationen_AU
dc.subjectRadiation dosesen_AU
dc.subjectWild animalsen_AU
dc.subjectGround disposalen_AU
dc.subjectRadioactive wastesen_AU
dc.subjectANSTOen_AU
dc.subjectNew South Walesen_AU
dc.subjectAustraliaen_AU
dc.subjectFresh wateren_AU
dc.subjectTreesen_AU
dc.titleBiota dose modelling: Little Forest Burial Ground scenarioen_AU
dc.typeConference Abstracten_AU
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