Transcript Radioactive Noble Gases in BOREXINO Techniques for

Task group 11
Material screening
Hardy Simgen
GERDA collaboration meeting
Gran Sasso, Feb. 3-5, 2005
Members of task group 11
INFN Gran Sasso
Carla Cattadori, Matthias Laubenstein, Luciano Pandola,
Claudia Tomei
Institute for Nuclear Research, Moscow
Igor Barabanov, Albert Gangapshev, Vasily Kornoukhov, Valery
Kuzminov, Evgeny Yanovich
Kurchatov Institute, Moscow
Andrey Tikhomirov
Joint Institute for Nuclear Research, Dubna
Alexander Klimenko, Anatoly Smolnikov, Sergey Vasiliev
MPI für Kernphysik, Heidelberg
Wolfgang Hampel, Gerd Heusser (Consultant), Josefa Oehm,
Ute Schwan, Hardy Simgen
Institute of Physics, Jagellonian University, Krakow
Marcin Wojcik
EC-JRC-IRMM, Radionuclide Metrology, Geel
Mikael Hult
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H. Simgen, MPI for Nuclear Physics / Heidelberg
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Available techniques
 Ge
spectrometry:
- Baksan
 NAA:
- LNGS
- MPI-K
- Hades (Belgium)
- LNGS
 ICP-MS:
- Mr. Gerdes (Univ. Frankfurt)
 222Rn
emanation measurements
- MPI-K
 -
- LNGS
- Moscow
and -spectroscopy
- Krakow
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H. Simgen, MPI for Nuclear Physics / Heidelberg
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Underground Ge spectrometers
 LNGS:
highest sensitivity:
GeMPI detector
~20 mBq/kg
(soon GeMPI-2)
 Baksan: 3(4)-detector setup
 Other deep underground detectors:
- LNGS, Baksan, Hades
sensitivity:
 MPI-K (15 mw.e.): 2 (soon 3)
~2 mBq/kg
Selection of appropriate spectrometer
depends on sample-size, sample-shape,
required sensitivity, logistics …
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H. Simgen, MPI for Nuclear Physics / Heidelberg
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NAA and ICP-MS
 They
are not for free!
 NAA sensitivity strongly depends on
matrix
 ICP-MS: Pre-treatment (purity)
 secular equilibrium may be broken
Careful selection of appropriate samples
for these techniques!
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H. Simgen, MPI for Nuclear Physics / Heidelberg
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222Rn
emanation technique
 Absolute
sensitivities: few 10 atoms (!)
 Achievable sensitivities strongly
dependent on samples (size, structure,
S/V-ratio) and clean sample containers.
 achievable: ~1 mBq/m2 and 0.3 mBq/m3
 consumes time and manpower
Careful selection of appropriate samples
for this technique
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H. Simgen, MPI for Nuclear Physics / Heidelberg
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- and -spectroscopy
 used
for surface contamination
studies
 210Pb and 210Po deposition
 -spectrometry most sensitive
Applied for lead screening
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H. Simgen, MPI for Nuclear Physics / Heidelberg
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Organisation
 We
need to know:
– Which samples? Where are they? Amount?
Size? Required sensitivity?
 Urgency!
What to be measured first?
 To decide / compare: All informations
must be collected at one place
 Can be done at MPI-K Heidelberg
 e-mail to: [email protected]
 Web-page in preparation: Will show
results and queued samples!
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H. Simgen, MPI for Nuclear Physics / Heidelberg
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