Investigating the lead-210 background in lead materials and chemical reagents

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dc.contributor.authorFroehlich, MBen_AU
dc.contributor.authorHotchkis, MACen_AU
dc.contributor.authorDastgiri, Fen_AU
dc.contributor.authorFifield, LKen_AU
dc.contributor.authorKoll, Den_AU
dc.contributor.authorMerchel, Sen_AU
dc.contributor.authorPavetich, Sen_AU
dc.contributor.authorSlavkovská, Zen_AU
dc.contributor.authorTims, SGen_AU
dc.contributor.authorWallner, Aen_AU
dc.date.accessioned2023-01-27T00:26:00Zen_AU
dc.date.available2023-01-27T00:26:00Zen_AU
dc.date.issued2022-11-29en_AU
dc.date.statistics2023-01-20en_AU
dc.description.abstractSABRE (Sodium iodide with Active Background REjection) is a direct detection dark matter experiment based on ultra-pure NaI(Tl) crystals. This experiment is well-shielded against external radiation and thus its background rate is driven by radioactive contaminants in the detector material and in the materials used for the construction of the experimental setup. Such radioactive contamination may come from long-lived, naturally occurring radionuclides or from cosmogenic activation. Therefore, a careful selection and development of ultra-pure materials and equipment is required, as well as a detailed knowledge of the residual radioactivity. Here, we focus on exploring the extraction of the radioisotope lead-210 (210Pb) in analytical grade NaI prior to examining Astro-grade NaI(Tl), which will eventually serve in the SABRE-South experiment as a scintillator detector for dark matter studies based in the Southern Hemisphere. We aim to measure 210Pb in NaI by accelerator mass spectrometry (a single atom counting technique), however this is challenging owing to the anticipated large mass of 1 kg. We will discuss two methods to extract Pb using different resins such as the Anion Exchange Resin (1-X8, 100-200 mesh Chloride form) and Sr® resin (100-150 mm). Furthermore, it is essential that any material and reagents in use should contain as little 210Pb as possible. For the chemical extraction of 210Pb from NaI, a stable Pb carrier is being used, which may contain traces of 210Pb as well. As 210Pb has a half-life of 22.2 years, the “older” the material (i.e., age of manufacturing and processing) the better, as most, if not all, of the 210Pb has decayed. However, 210Pb is a decay product of U, which is omnipresent in the environment. Therefore, if uranium has not been completely removed from the Pb material during processing, 210Pb will be continuously produced. Here, we will present results for a series of Pb materials together with various reagents which were measured using the 1 MV Vega accelerator at ANSTO. Their 210Pb/208Pb isotopic ratios vary between (3-30)´10-14 for the Pb carriers (0.38-173 mBq 210Pb/g) and range from 1´10-14 to 3´10-11 for the reagents (4-194 mBq 210Pb/g), respectively.en_AU
dc.identifier.citationFroehlich, M., Hotchkis, M., Dastgiri, F., Fifield, K, Koll, K., Merchel, S., Pavetich, S., Slavkovská, Z., Tims, S., & Wallner, A. (2022). Investigating the lead-210 background in lead materials and chemical reagents. Paper presented to SPERA 2022 - Connecting People, developing solutions for a Changing Environment, 28-30 November 2022, Chrischurch, New Zealand. (pp. 31-32). Retrieved from: https://au-admin.eventscloud.com/file_uploads/baa6bb17538b457fbd436f1552075bea_SPERA2022e-handbook.pdfen_AU
dc.identifier.conferenceenddate30 November 2022en_AU
dc.identifier.conferencenameSPERA 2022 - Connecting people, developing solutions for a changing environmenten_AU
dc.identifier.conferenceplaceChristchurch, New Zealanden_AU
dc.identifier.conferencestartdate28 November 2022en_AU
dc.identifier.pagination31-32en_AU
dc.identifier.urihttps://au-admin.eventscloud.com/file_uploads/baa6bb17538b457fbd436f1552075bea_SPERA2022e-handbook.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14517en_AU
dc.language.isoenen_AU
dc.publisherSouth Pacific Environmental Radioactivity Associationen_AU
dc.subjectLead 210en_AU
dc.subjectMaterialsen_AU
dc.subjectChemicalsen_AU
dc.subjectReagentsen_AU
dc.subjectSodium iodidesen_AU
dc.subjectNonluminous matteren_AU
dc.subjectCrystalsen_AU
dc.subjectContaminationen_AU
dc.subjectRadioisotopesen_AU
dc.subjectSouthern Hemisphereen_AU
dc.subjectMass spectroscopyen_AU
dc.titleInvestigating the lead-210 background in lead materials and chemical reagentsen_AU
dc.typeConference Abstracten_AU
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