Radio-impurity measurements for a dark matter dodium Iidide detector

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dc.contributor.authorDastgiri, Fen_AU
dc.contributor.authorSlavkovska, Zen_AU
dc.contributor.authorFroehlich, MBen_AU
dc.contributor.authorHotchkis, MACen_AU
dc.contributor.authorKoll, Den_AU
dc.contributor.authorMerchel, Sen_AU
dc.contributor.authorPavetich, Sen_AU
dc.contributor.authorSims, SGen_AU
dc.contributor.authorFifield, LKen_AU
dc.contributor.authorWallner, Aen_AU
dc.date.accessioned2023-01-20T03:34:14Zen_AU
dc.date.available2023-01-20T03:34:14Zen_AU
dc.date.issued2021-11-17en_AU
dc.date.statistics2022-06-30en_AU
dc.description.abstractThe first dark matter detector is being built in the Stawell gold mine in south-eastern Australia, as the southern hemisphere arm of an international collaboration SABRE (Sodium Iodide with Active Background Rejection). This experiment employs ultra-low background sodium iodide (NaI) detectors placed in highly shielded vessels across both hemispheres. The aim is to confirm or refute annual modulation claims attributed to dark matter particles by the DAMA/LIBRA collaboration at the Laboratori Nazionali del Gran Sasso in Italy. This requires the lowest possible concentration of radio-contaminants that can be achieved, to minimise the potential for radiation signals that can mimic dark matter particles signals. We report on the techniques employed for the detection of potentially problematic contaminants in the NaI material from which the crystals will be grown. We focus on the establishment of the measurement techniques of ⁴ ⁰ K and ²¹⁰ Pb at the Australian National University and ANSTO. For the measurement of ⁴ ⁰ K, Inductively Coupled Plasma Mass Spectrometry (ICP-MS) was used to measure the concentration of ³⁹ K, and from the well-known natural abundance ratios of ³⁹ K/⁴ ⁰ K, the concentration of ⁴ ⁰ K was inferred. The challenges associated with measuring ultraprecise levels of ³⁹ K, and the techniques of minimising the introduction of potassium in the sample preparation will be discussed. 210-Lead was measured using AMS. The ²¹⁰ Pb concentration in the NaI powder is very low, which necessitates that large amounts (~ 1kg) of the powder need to be processed to result in sufficient atoms for an AMS measurement. This low concentration requires the additions of a Pb-carrier (~ 1mg), which itself needs to contain minimal ²¹⁰ Pb. Several lead materials have been investigated and will be reported. In addition, we will discuss the different lead compounds and cathode materials used to optimise the beam current and minimise the background. Other contaminants of potential interest such as ³H, ²³²Th and ²³⁸ U; especially those identified in DAMA/LIBRA and other NaI detectors will be presented.en_AU
dc.identifier.citationDastgiri, F., Slavkovska, Z., Froehlich, M. B., Hotchkis, M. A. C., Koll. D., Merchel, S., Pavetich, S., Tims, S. G., Fifield, K., & Wallner, A. (2021). Radio-impurity measurements for a dark matter dodium Iidide detector. Paper presented to the 15th International Conference on Accelerator Mass Spectrometry. ANSTO Sydney, Australia. November 15th – 19th, 2021. (pp. 150). Retrieved from: https://ams15sydney.com/wp-content/uploads/2021/11/AMS-15-Full-Program-and-Abstract-Book-R-1.pdfen_AU
dc.identifier.conferenceenddate19 November 2021en_AU
dc.identifier.conferencename15th International Conference on Accelerator Mass Spectrometryen_AU
dc.identifier.conferenceplaceSydney, Australiaen_AU
dc.identifier.conferencestartdate15 November 2021en_AU
dc.identifier.pagination150en_AU
dc.identifier.urihttps://ams15sydney.com/wp-content/uploads/2021/11/AMS-15-Full-Program-and-Abstract-Book-R-1.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14447en_AU
dc.language.isoenen_AU
dc.publisherAustralian Nuclear Science and Technology Organisationen_AU
dc.subjectNonluminous matteren_AU
dc.subjectUniverseen_AU
dc.subjectMinesen_AU
dc.subjectUnderground facilitiesen_AU
dc.subjectAustraliaen_AU
dc.subjectSodium iodidesen_AU
dc.subjectParticlesen_AU
dc.subjectModulationen_AU
dc.subjectCrystalsen_AU
dc.titleRadio-impurity measurements for a dark matter dodium Iidide detectoren_AU
dc.typeConference Abstracten_AU
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