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Low Background Counting Facilities at Lawrence Berkeley National Laboratory. Open to the Public & Open for Business. Scope of Low Background Counting at LBL. Direct g -ray Counting of Materials g -ray Counting of neutron-activated Materials NaI and HPGe detectors

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## Low Background Counting Facilities at Lawrence Berkeley National Laboratory

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**Low Background Counting Facilities at Lawrence Berkeley**National Laboratory Open to the Public & Open for Business S-1 Workshop Low Background Counting**Scope of Low Background Counting at LBL**• Direct g-ray Counting of Materials • g-ray Counting of neutron-activated Materials NaI and HPGe detectors • Surface Facility on LBL campus • Low Background, Well-shielded Facility ~180 m underground (water) at Oroville in Northern California Foothills S-1 Workshop Low Background Counting**Logistics**• Sample size: ~ 2 kg to obtain highest sensitivity, smaller samples possible • Counting times: ~ 2 weeks for highest sensitivity, but generally activity dependent • Neutron activated samples require careful coordination in advance • Samples should, ideally, stack on/around detectors, some customizing is possible at LBL • Fed-ex works fine S-1 Workshop Low Background Counting**Facilities and Sensitivities**• LBL (Building 72) Facility • NaI and HPGe detectors • ≥1.5m low activity concrete • Used for initial screening, ~ ppb level U, Th, 1 ppm K, ~0.05 pCi/Kg 60Co S-1 Workshop Low Background Counting**Oroville Facility**• Housed in Powerhouse of the Oroville Dam ~ 180 mwe, low activity Pb and Cu shields, Radon flushed counting chambers. • HPGe detectors • Site of the UCSB-LBL 0nbb experiment • ~ 50 to 100 ppt U, Th, 100 ppb K, 0.005 pCi/Kg 60Co S-1 Workshop Low Background Counting**Table of Low Background Counting Sensitivities at LBNL’s**Two Facilities. • Sensitivities are currently limited by detector contamination. More depth is not essential. S-1 Workshop Low Background Counting**Survey of “Customers”**• 25 years of experience and service to the Nuclear Physics, High Energy Physics, Non-accelerator Physics communities • “open” facility, and expandable to house additional detectors as demand warrants • UCSB-LBL 0nbb experiment • Sudbury Neutrino Observatory: solar n • CDMS: Dark Matter • KamLAND: reactor n • Katrin: tritium beta decay • Majorana, CUORE: 0nbb • Daya Bay: q13 S-1 Workshop Low Background Counting**Contact Information**• Staff: Kevin Lesko Al Smith Donna Hurley ktlesko@lbl.gov 510-486-7731 S-1 Workshop Low Background Counting

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