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Proposal to put 232 Th Source in m K for > 2MeV Gamma  Detection

Proposal to put 232 Th Source in m K for > 2MeV Gamma  Detection. Bobby Lanza May 1, 2008 Neutron Meeting. The case for 232 Th. Why are  ’ s with E > 2MeV important? Muons interacting with the bedrock at Soudan create photons at this energy scale. Source of background.

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Proposal to put 232 Th Source in m K for > 2MeV Gamma  Detection

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  1. Proposal to put 232Th Source in mK for > 2MeV GammaDetection Bobby Lanza May 1, 2008 Neutron Meeting

  2. The case for 232Th • Why are ’s with E > 2MeV important? • Muons interacting with the bedrock at Soudan create photons at this energy scale. • Source of background. • What can mK do? • ’s above the 2MeV threshold can impart enough energy to electrons to make them Cherenkov radiate in mK. • Calibration with a test source would inform possible future tests at Soudan.

  3. Why 232Th instead of the Depleted Uranium we have? • DU has many sticking points in its decay chain (long lived daughters), before • the high energy gammas. • DU chemically purified approx. 30 years ago, so not in equilibrium yet. > 2MeV ’s Sticking Points

  4. 232Th Approx. 10-15 yrs old (longer than combined daughter half-lives), so likely in equilibrium. • Above threshold gammas available from 208Tl --> 208Pb decay. 2.6 MeV ’s

  5. We have a 232Th Source • 0.1g of 232Th in liquid solution. • 400 decays per second expected. • Standard calibration source.

  6. Near Future (Proposed) • Design simple containment vessel for 232Th & install in mK. • Take data with liquid 232Th source. • Do Monte Carlo & compare to data.

  7. --Thanks--

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