Assay methods for 238U, 232Th, and 210Pb in lead and calibration of 210Bi bremsstrahlung emission from lead

Orrell, J. L.; Aalseth, Craig E.; Arnquist, I. J.; Eggemeyer, Tere A.; Glasgow, Brian D.; Hoppe, E. W.; Keillor, Martin E.; Morley, Shannon M.; Myers, A.W.; Overman, C.T.; Shaff, Sarah M.; Thommasson, Kimbrelle S.

doi:10.1007/s10967-016-4732-6

Cited by 20 publications

(21 citation statements)

References 22 publications

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“…The box is located in between 2.5 cm (bottom) and 18 cm (top) of lead shielding, inside a cylindrical copper cryostat. The cryostat is then placed inside a lead shield, of which the innermost 5 cm is archaeological [9], and the outer 15 cm is low activity [10]. Outside of this lead shield, a 42 cm polyethylene layer provides protection against external neutrons.…”

Section: Pos(icrc2021)539mentioning

confidence: 99%

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Results on low-mass weakly interacting massive particles from a 11 kg d target exposure of DAMIC at SNOLAB

Traina¹,

Aguilar-Arevalo²,

Amidei³

et al. 2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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Section: Pos(icrc2021)539mentioning

confidence: 99%

“…8 Universität Zürich Physik Institut, Zurich, Switzerland. 9 SNOLAB, Lively, Ontario, Canada. 10 SUBATECH, CNRS-IN2P3, IMT Atlantique, Université de Nantes, Nantes, France.…”

Section: Full Authors List: Damic Collaborationmentioning

confidence: 99%

Results on low-mass weakly interacting massive particles from a 11 kg d target exposure of DAMIC at SNOLAB

Traina¹,

Aguilar-Arevalo²,

Amidei³

et al. 2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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“…Live lead 'standards' span a range of concentrations from 0.6-330 Bq of 210 Pb per kg of lead [31,32]. Each 210 Pb standard is a solid, rectilinear piece of lead measuring 1×10×10 cm 3 .…”

Section: Run Startmentioning

confidence: 99%

Evaluation and mitigation of trace 210Pb contamination on copper surfaces

Bunker

Aramaki

Arnquist

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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Clean materials are required to construct and operate many low-background physics experiments. High-purity copper has found broad use because of its physical properties and availability. In this paper, we describe methods to assay and mitigate 210 Pb contamination on copper surfaces, such as from exposure to environmental radon or coming from bulk impurities. We evaluated the efficacy of wet etching on commercial samples and observed that 210 Po contamination from the copper bulk does not readily pass into solution. During the etch, the polonium appears to trap at the copper-etchant boundary, such that it is effectively concentrated at the copper surface. We observed a different behavior for 210 Pb; high-sensitivity measurements of the alpha emissivity versus time indicate the lowest level of 210 Pb contamination ever reported for a commercial copper surface: 0 ± 12 nBq/cm 2 (1σ). Additionally, we have demonstrated the effectiveness of mitigating trace 210 Pb and 210 Po surface backgrounds using custom, high-purity electroplating techniques. These approaches were evaluated utilizing assays performed with an XIA UltraLo-1800 alpha spectrometer.

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“…The signal induced by 210 Po is in a favourable region of the energy spectrum with an excellent signal-to-background ratio (at 5.4 MeV), and it also has a branching ratio of almost 100%. HP-Ge <900 4.5 [22] HP-Ge <1300 22.1 [23] Planar Si 100 0.01 [24] Bolometer <20 0.09 [25] Bolometer <4 0.01 [20] Spectrometry with HP-Ge detectors is extremely effective for investigating the concentration of 238 U and 232 Th decay chain products. This is possible thanks to the high energy γs produced by these nuclides, (up to 2.6 MeV) which reduce the possibility of self-absorption in the sample, therefore enhancing the detection efficiency.…”

Section: Archeological Pbmentioning

confidence: 99%

Radiopurity of an archaeological Roman lead cryogenic detector

et al. 2019

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Archeological Roman lead (Pb) is known to be a suitable material for shielding experimental apparata in rare event searches. In the past years the intrinsic radiopurity of this material was investigated using different technologies. In this work we applied the latest advancements in cryogenic techniques to study the bulk radiopurity of a 1 cm 3 sample of archeological Roman Pb. We report the lowest ever measured limit on 210 Pb content in Roman Pb, with a concentration lower than 715 µBq/kg. Furthermore, we also studied 238 U and 232 Th impurity concentrations. Our values concur with independent measurements reported in literature.

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Assay methods for 238U, 232Th, and 210Pb in lead and calibration of 210Bi bremsstrahlung emission from lead

Abstract: Assay methods for measuring 238

Cited by 20 publications

References 22 publications

Results on low-mass weakly interacting massive particles from a 11 kg d target exposure of DAMIC at SNOLAB

Results on low-mass weakly interacting massive particles from a 11 kg d target exposure of DAMIC at SNOLAB

Evaluation and mitigation of trace 210Pb contamination on copper surfaces

Radiopurity of an archaeological Roman lead cryogenic detector

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