The 210Pb Bremsstrahlung In The Background Of Lead Shields

Journal Article · Mon Apr 23 04:00:00 EDT 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2733054· OSTI ID:21057297

Mrdja, D; Bikit, I; Slivka, J; Veskovic, M ^[1]

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1. Department of Physics, Faculty of Sciences, University of Novi Sad, Novi Sad 21 000, Trg Dositeja Obradovica 4 (Serbia)

Contemporary theories of dark matter predict that weakly interacting massive particles interact with matter by nuclear recoils leaving in the detector energies up 50 keV. The bremsstrahlung of 210Pb contributes to this spectral region. The 46.5 keV gamma intensity of 210Pb in the background can be easily reduced by inner lining, but the bremsstrahlung from the 1.2 MeV maximal energy beta decay will reach the lead shielded Ge detector. The spectrum of this bremsstrahlung is calculated by numerically fitting the beta spectrum and integrating the Koch-Motz formula. The absorption of the bremsstrahlung spectrum in the lead and detection efficiencies for Ge detector are calculated by the effective solid angle algorithm, using correction for photopeak/compton ratio of cross sections in Ge. By comparison with the measured spectrum, it is shown, that for the lead with 25 Bq/kg of 210Pb, up to 500 keV, the bremsstrahlung contribution to the background is about 20%. The calculated bremsstrahlung intensity is in good agreement with the experimental result derived in Max Planck Institute, Heidelberg.

• OSTI ID: 21057297
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 899; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABSORPTION
ALGORITHMS
BETA DECAY
BETA SPECTRA
BREMSSTRAHLUNG
COMPARATIVE EVALUATIONS
CORRECTIONS
CROSS SECTIONS
GAMMA SPECTROMETERS
GE SEMICONDUCTOR DETECTORS
KEV RANGE
LEAD
LEAD 210
NONLUMINOUS MATTER
PARTICLE IDENTIFICATION
RECOILS
SHIELDS