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Journal Article

A 220Rn source for the calibration of low-background experiments

MPS-Authors
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Schreiner,  Jochen
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Simgen,  Hardy
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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http://iopscience.iop.org/article/10.1088/1748-0221/11/04/P04004/pdf
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1602.01138.pdf
(Preprint), 936KB

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Citation

Lang, R. F., Brown, A., Brown, E., Cervantes, M., Macmullin, S., Masson, D., et al. (2016). A 220Rn source for the calibration of low-background experiments. Journal of Instrumentation, 11: P04004. doi:10.1088/1748-0221/11/04/P04004.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002B-0682-7
Abstract
We characterize two 40 kBq sources of electrodeposited Th-228 for use in low-background experiments. The sources efficiently emanate Rn-220, a noble gas that can diffuse in a detector volume. Rn-220 and its daughter isotopes produce alpha, beta, and gamma-radiation, which may used to calibrate a variety of detector responses and features, before decaying completely in only a few days. We perform various tests to place limits on the release of other long-lived isotopes. In particular, we find an emanation of <0.008 atoms/min/kBq (90% CL) for Th-228 and 1.53 atoms/min/kBq for Ra-224. The sources lend themselves in particular to the calibration of detectors employing liquid noble elements such as argon and xenon. With the source mounted in a noble gas system, we demonstrate that filters are highly efficient in reducing the activity of these longer-lived isotopes further. We thus confirm the suitability of these sources even for use in next-generation experiments, such as XENON1T/XENONnT, LZ, and nEXO.