Existing counting facilities in the US Analysis centers at most Universities User fees – cheaper for University faculty Commercial Labs Longer turn around, more expensive, more standardized “Use for Others” at most national labs (Oak Ridge, LANL, BNL) A few shallow middle depth sites open for users LBL Bldg72 and Oroville Dam – now LOMO at PNNL - soon Deep screening sites are only in development stage WIPP (MEGA ) Soudan: -screening capability in SOLO Plans to create a multi-purpose LBCF Really, Really Deep sites are DUSEL era DEPTH
Transcript
Existing counting facilities in the US
Analysis centers at most Universities User fees – cheaper for University faculty
Commercial LabsLonger turn around, more expensive, more
standardized
“Use for Others” at most national labs (Oak Ridge, LANL, BNL)
A few shallow middle depth sites open for usersLBL Bldg72 and Oroville Dam – nowLOMO at PNNL - soon
Deep screening sites are only in development stageWIPP (MEGA )Soudan: -screening capability in SOLO
Plans to create a multi-purpose LBCF
Really, Really Deep sites are DUSEL era
DEPTH
Sensitivity for US Sites
Surface countersLBL Bldg 72,PNNL, and many other places etc.
Shielded on surface PNNL 17-A
LBNL Oroville
2000 + mweSoudan, MEGA
LoMoCF estimate
Berkeley Complex:
Surface and Shallow Site under same umbrella organization: Institute of Nuclear and Particle AstrophysicsSTAFFKevin LeskoAl SmithDick McDonaldDonna Hurley
Throughput determined by number of Ge detectors
Bldg72 has NaI counters and a 130% HPGe, Oroville has a 80% p-type HPGe
Major User: SNO (screened virgin and machined acrylic, plastic resins, PMT envelopes, internal components, stainless steel, etc.)
Also Clean room preparation and operation, sample handling procedures
Sensitivity is currently limited by detector contamination
Bldg 72 (LBL) Dam (140 mi) from LBL
PNNL – UW Complex:
Surface + 17-A ULB + new initiative at Lower Monumental Dam
• 1 hr from PNNL
• 37 meters of overburden
• Operated by US Army Corp of Engineers
Inside LoMo Counting Facility:
Currently being used as cosmogenic isolation space for copper stock and MEGA parts
Plan is to install gamma screening in lead cave. Funding is in place.
4’
1’
1’
4’ 1’1’
Wat
er
trou
gh
~8’
Person
Access
4-person elevator access Two sets of 3 HPGe counters with active cosmic veto shield
UWJ.A. FormaggioJ.F. Wilkerson
PNNLC.E. Aalseth
R.L. BrodzinskiT. HossbachH.S. MileyJ.L. Orrell
WIPP• DOE Facility
• Impressiveinfrastructure
• Modest depth(1600 mwe)
• Science not primary mission
• SEGA underground by next summer (not a screener)
• Assembling MEGA at WIPP now.
• 1st detector ready to take data
• Completed in a couple years.
Low background Screening and Prototyping Facility
at the Soudan Underground Lab
Last Soudan2 proton decay calorimeters (at back) were removed Nov 23rd 2004
SOLO HPGeJim Reeves: Cu Electroforming SBIR + Cu screening detector (microBq/kg)
Diode M (35%)Twin (75%)UF detector (100%)
Arrives 3rd week in March
Low background Screening and Prototyping Facility
at the Soudan Underground Lab
CDMS offices
CDMS Aux Clean RoomBFand SiLi detector, leaching lab? other?
Veto shield repaired last summer DAQ: location & time stamp for each muon
• Continue to improve gamma screeningFix Twin, upgrade electronics, upgrade DAQ,Diode-M becomes pre-screener, UF HPGe into castle
• Provide novel beta screeners through CWRU, Caltech … (or possible MRI 2006)
• Take this next year to Increase size of collaboration
Modify design according to input and new users
• Put in complete proposal next Fall ‘05
Funding from NSF, DOE (HEP and Nuc) implies main justification must be from Astro/HEP/Nucl community. Reduce financial impact by maintaining it thru user fees to other groups
DUSEL is a different model – can we get other divisions involved?
University of Minnesota Intercollegiate Grant
1. Seek out other user communities for LBCF
2. Coordinate low level counting/analysis across sites
Examples of other user communities involved:
Tritium and 14C in groundwater Radioactive environmental sampling (accidental release of radio-isotopes)Exposure assessment studies (14C as a tracer of particiulate lung burden) Epidemiological studies of uranium workers (tissue samples)Short-lived isotopes for sediment datingTracers in uptake and transport (geomicrobiology)Bioremediation studies etc etc…
These “other” users need well-type HPGe, chemical separation, sample handling AND beta-counting applications (14C, 3H, 40K)
DUSEL work has uncovered new synergies with
geomicrobiology, geology, hydrologyWORKSHOP in Minneapolis in July to explore these synergies
Material to be screened:Ge, Si wafersLEDs Copper (detector holders, icebox, copper tape)Low activity solder, silver epoxy, brass screws, cables and connectorsMagnetic shieldStriplines, side coaxes and squet cards, kevlarShielding materials (inner lead, outer lead, copper, polyethylene)
