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Contributions from Impurities in Shielding Material

background can come from radioactive impurities in the shielding material

typical lead shielding material contains:

210Pb (46.5 keV -ray)

210Bi (1161 keV -ray)

shielding material may also contain slight               amounts of 60Co and 137Cs, which may cause problems for some low-level measurements.

some samples of lead have shown activity levels of 1.5 Bq/g.

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