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…continued from solar neutrino presentation, NESS02, Sept. 2002. 6 papers presented tomorrow morning Many thanks to Wick Haxton for giving us the extra time 14C in deep oilfields Homestake rails as a source of radiopure structural and shielding material.

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continued from solar neutrino presentation ness02 sept 2002
…continued from solar neutrino presentation,NESS02, Sept. 2002
  • 6 papers presented tomorrow morning
  • Many thanks to Wick Haxton for giving us the extra time
  • 14C in deep oilfields
  • Homestake rails as a source of radiopure structural and shielding material
14c in deep oilfields paper 5 to be submitted to nim
14C in deep oilfields (paper 5, to be submitted to NIM)
  • Paper by G.B., E. Carter (RET), N. Harris, V. Paolone
  • Borexino results and partial interpretation

(Schoenert-Resconi)

  • Single carbon chemistry, gas field
  • Tests and further research (by others)
14 c in petroleum
14C in petroleum
  • The original (atmospheric) 14C in petroleum is long gone
  • 14C recharged underground by neutron flux from rock
  • The Solar Neutrino TPC needs at least 14C/12C=r<10-18 to work in the (pp) region, Borexino/Kamland need r<10-21
the borexino result
The Borexino result
  • Borexino, using the CTF facility, found (G. Alimonti et al., Phys. Lett. B 422, 349, 1998) r=(1.94+-0.09)10-18 for Lybian petroleum
  • However, a previous test on methane gave a limit of r< 10-18
  • They have since measured petroleum from the Corpus Christi, TX, area at r=11X10-18
  • Borexino and Kamland have overwhelming 14C backgrounds below 250 keV
interpretation schoenert resconi
Interpretation (Schoenert-Resconi)
  • Identifies dominant reaction as 14N(n,p)14C
  • Petroleum has typical 2% nitrogen content due to biological origin (i.e, DNA)
  • Identifies the best oilfields as having low U/Th, low N
  • Predicts 10-16 <r< 10-20
our approach focus on methane
Our approach: focus on methane
  • Methane is easy to separate by boiloff
  • Methane has different chemistry than other hydrocarbons
  • Isotopical separation does not work unfortunately
  • Chain must proceed as:
some facts about gasfields
Some facts about gasfields
  • Petroleum starts as crude and becomes a gas as it ages (hotter, deeper)
  • Light alkanes migrate and move away – gasfields with zero nitrogen can be found
  • Natural gas is typically 90% methane, with some ethane and propane
specifying the perfect gasfield
Specifying the perfect gasfield
  • 90% methane, with some ethane (factor 50 purity)
  • proven low U content (several) (factor 30)
  • No kerogen, no nitrogen (factor 50) (some)
  • No bacterial activity
  • No H2S
  • Probably no water is better
  • Double boiloff recommended (CO)
conclusions
Conclusions
  • Two new ways to strongly suppress 14C in hydrocarbons – both use methane as feedstock
  • TPC almost certainly immune to 14C backgrounds
  • Our colleagues have work to do, including devising a clean industrial reducing process, but r=10-22 appears feasible
homestake rails as a source of radiopure structural and shielding material paper 7
Homestake rails as a source of radiopure structural and shielding material (Paper 7)
  • Paper by G. Aberle, G. B., R. Brodzinski, E. Loh
  • Major steel contaminants
  • Quantity and quality
steel major radiocontaminants
Steel major radiocontaminants
  • 54Mn (half life=312 days, E=835 keV). Activated by cosmic rays at surface, equilibrium activity 5mBq/Kg (equivalent U=10-10g/g)
  • 60Co (half life=5.27 days, E=1.2 MeV). Also cosmic-activated, but mostly due to contamination. Usually dominant radiocontaminant, wide variance.
  • U limits at the 10-11g/g level exist for some steels. Some variance expected once measurements are refined
homestake steel older than 50 years
Homestake steel (older than 50 years)
  • Free of both 54Mn and 60Co ( 60Co measured by R.B. on 125 yrs old steel)
  • 75 miles of rails older than 50 years can be readily harvested (5 kTons)
  • 1 kTon available in I-beams and pipes of various sizes
  • Many advantages (spikes, no travel, standard sizes, several sizes, records, upper levels, very cheap)
goals and possible uses
Goals and possible uses
  • 10-11-10-13g/g U/Th may be feasible (need measurements)
  • To be used as part of the neutron shield for DRIFT (G.B.)
  • If 10-11g/g, Solar Neutrino TPC detector plane frames (G.B.)
  • If 10-12g/g, Solar Neutrino TPC inner shield support (deionized ice) (G.B.)
conclusions1
Conclusions
  • Homestake rails are potentially a great treasure which could serve the need for radiopure structural and/or solid shielding material of EVERY NESS02 PARTICIPANT
  • The funding agencies should consider funding preliminary testing of the hypothesis