1. Task group 11 Material screening Hardy Simgen GERDA collaboration meeting Gran Sasso, Feb. 3-5, 2005

2. H. Simgen, MPI for Nuclear Physics / Heidelberg
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
27/11/2018
H. Simgen, MPI for Nuclear Physics / Heidelberg

3. H. Simgen, MPI for Nuclear Physics / Heidelberg
Available techniques
Ge spectrometry: - LNGS - MPI-K - Baksan - Hades (Belgium)
NAA: - LNGS
ICP-MS:
- Mr. Gerdes (Univ. Frankfurt) - LNGS
222Rn emanation measurements
- MPI-K - Moscow
- and -spectroscopy
- Krakow
27/11/2018
H. Simgen, MPI for Nuclear Physics / Heidelberg

4. Underground Ge spectrometers
LNGS: GeMPI detector
(soon GeMPI-2)
Baksan: 3(4)-detector setup
Other deep underground detectors:
- LNGS, Baksan, Hades
MPI-K (15 mw.e.): 2 (soon 3)
Selection of appropriate spectrometer depends on sample-size, sample-shape, required sensitivity, logistics …
highest sensitivity:
~20 mBq/kg
sensitivity:
~2 mBq/kg
27/11/2018
H. Simgen, MPI for Nuclear Physics / Heidelberg

5. 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!
27/11/2018
H. Simgen, MPI for Nuclear Physics / Heidelberg

6. 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
27/11/2018
H. Simgen, MPI for Nuclear Physics / Heidelberg

7. - and -spectroscopy used for surface contamination studies
210Pb and 210Po deposition
-spectrometry most sensitive
Applied for lead screening
27/11/2018
H. Simgen, MPI for Nuclear Physics / Heidelberg

8. H. Simgen, MPI for Nuclear Physics / Heidelberg
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
 to:
Web-page in preparation: Will show results and queued samples!
27/11/2018
H. Simgen, MPI for Nuclear Physics / Heidelberg