THE LABORATORY FOR LOW-LEVEL RADIOACTIVITY MEASUREMENTS @ LNGS Matthias Laubenstein

THE LABORATORY FOR THE LABORATORY FOR LOW-LEVEL LOW-LEVEL

RADIOACTIVITY RADIOACTIVITY MEASUREMENTS @ LNGSMEASUREMENTS @ LNGS

Matthias LaubensteinMatthias LaubensteinI.N.F.N. - L.N.G.S.I.N.F.N. - L.N.G.S.

10-SEP-2004 1st Meeting, ILIAS JRA1/LBT-DUSL, Edinburgh

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Location (present and future)Location (present and future)

PresentPresent: : 32 m32 m22 on one floor in service tunnel on one floor in service tunnel

FutureFuture: : 60 m60 m22 distributed on three floors in hall A distributed on three floors in hall A


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1,E-04

1,E-03

1,E-02

1,E-01

1,E+00

1,E+01

1,E+02

1,E+03

0 500 1000 1500 2000 2500 3000

Energy [keV]

Nor

mal

ised

coun

ting

rate

[cou

nts d

-1 k

eV-1

kg

Ge

-1]

above ground

LNGS

511 keV40K 208Tl

60Co


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HPGe detectorsdetector total and peak background count rate [d-1 kg-1

Ge]

40-2700 keV 352 keV 583 keV 1461 keV

GeBer 3686 3.3 1.5 4.6

GeMi 611 5.6 2.1 5.2

GePV 482 2.8 2.1 3.2

GsOr 469 2.4 0.76 4.3

GePaolo 226 0.83 0.38 1.4

GeCris 87 <0.39 <0.29 1.0

GeMPI 30 <0.20 <0.15 0.36


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Collaboration of European Low-Level Underground Laboratories


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University ofIceland

IAEA-MEL

ARCS

LNGS

IRMM

LSCE

VKTA

MPI-K

PTB


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10-1

100

101

102

103

104

105

106N

orm

alis

ed c

oun

tin

g ra

te [

d-1 k

g-1]

10-2

Depth [m w.e.]

0 3000

1000

2000

4000

5000

Mu

on f

luen

ce r

ate

[a.u

.]

LSCE

LNGS

PTB

JRC-IRMM

VKTA Rossendorf

above ground


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10-1

100

101

102

103

104

105

106N

orm

alis

ed c

oun

tin

g ra

te [

d-1 k

g-1]

10-2

Depth [m w.e.]

0 3000

1000

2000

4000

5000

Mu

on f

luen

ce r

ate

[a.u

.]

199319961997

LNGS


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Background characterisationBackground characterisation

• gamma spectrometrygamma spectrometry

• directional photon flux in hall Adirectional photon flux in hall A(with portable HPGe detector and MCA)(with portable HPGe detector and MCA)

• method rather fast and simplemethod rather fast and simple

(LN(LN22-free cooling, simple setup)-free cooling, simple setup)


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First results of photon First results of photon background characterisation in background characterisation in

hall A hall A (by courtesy of O. Chkvorets)(by courtesy of O. Chkvorets)


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Further scientific topicsFurther scientific topics

• Radiocarbon and tritium Radiocarbon and tritium measurements measurements (Radiodating Laboratory)(Radiodating Laboratory)

• Radon groundwater monitoringRadon groundwater monitoring(Environmental and geophysical monitoring of (Environmental and geophysical monitoring of the Gran Sasso aquifer)the Gran Sasso aquifer)

• Development and characterization Development and characterization of new detectorsof new detectors (for nuclear spectrometry of environmental(for nuclear spectrometry of environmental radioactivity)radioactivity)


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Radiocarbon measurementsRadiocarbon measurements

ERMESERMES

Ultra low-level liquid scintillation spectroscopyUltra low-level liquid scintillation spectroscopy

Using YAP:Ce vialsUsing YAP:Ce vials

Using YAP:Ce powderUsing YAP:Ce powder

COCO22 directly from combustion directly from combustion


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Ultra low level liquid scintillation Ultra low level liquid scintillation spectrometryspectrometry


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AnticoincidenceAnticoincidence

W. Plastino, L. Kaihola, P. Bartolomei, F. Bella, W. Plastino, L. Kaihola, P. Bartolomei, F. Bella, Cosmic background reduction in the Cosmic background reduction in the radiocarbon measurements by radiocarbon measurements by liquid scintillation spectrometry at the liquid scintillation spectrometry at the underground laboratory of Gran Sasso., underground laboratory of Gran Sasso., Radiocarbon, 43 (2A), 157-Radiocarbon, 43 (2A), 157-161, 2001.161, 2001.

0

1

2

3

4

5

1 101 201 301 401 501 601 701 801 901 1001

Channel

CP

M/C

h

a)

0

1

2

3

4

5

1 101 201 301 401 501 601 701 801 901 1001

Channel

CP

M/C

h

b)


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Coincidence (factor 10^2)Coincidence (factor 10^2)

0

1

2

1 101 201 301 401 501 601 701 801 901 1001

Channel

CP

M/C

h

a)

0

1

2

1 101 201 301 401 501 601 701 801 901 1001

Channel

CP

M/C

h

b)

W. Plastino, L. Kaihola, P. Bartolomei, F. Bella, W. Plastino, L. Kaihola, P. Bartolomei, F. Bella, Cosmic background reduction in the Cosmic background reduction in the radiocarbon measurements by radiocarbon measurements by liquid scintillation spectrometry at the liquid scintillation spectrometry at the underground laboratory of Gran Sasso., underground laboratory of Gran Sasso., Radiocarbon, 43 (2A), 157-Radiocarbon, 43 (2A), 157-161, 2001.161, 2001.

x101

x103


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Background comparisonBackground comparisonVial background in 14C window

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0 2 4 6 8

volume mL

CP

M Gran Sasso

Other surface labs

W. Plastino, L. Kaihola, W. Plastino, L. Kaihola, Surface and underground ultra low level liquid scintillation Surface and underground ultra low level liquid scintillation spectrometry, spectrometry, Radiocarbon, Radiocarbon, submitted.submitted.


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Radon groundwater monitoring Radon groundwater monitoring at Gran Sasso National at Gran Sasso National

LaboratoryLaboratory

W. Plastino, F. Bella, W. Plastino, F. Bella, Radon groundwater monitoring at underground laboratories of Gran Sasso Radon groundwater monitoring at underground laboratories of Gran Sasso (Italy),(Italy), Geophysical Research Letters, 28 (14), 2675-2678, 2001.Geophysical Research Letters, 28 (14), 2675-2678, 2001.


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overthrust fault

Present radon groundwater Present radon groundwater monitoringmonitoring


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Direct Radon groundwater monitoringDirect Radon groundwater monitoringin situin situ

ERMESERMES

Using YAP:Ce + PM + Elect.Using YAP:Ce + PM + Elect.

Using YAP:Ce powder +Using YAP:Ce powder +

PM + Electr.PM + Electr.

Detector: YAP:Ce crystalDetector: YAP:Ce crystal PhotomultiplierPhotomultiplier High-Voltage Power SupplyHigh-Voltage Power Supply

PMT

YAP

IN

OUT

HV ELE

IN OUT


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Future radon groundwater Future radon groundwater monitoringmonitoring

overthrust fault


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OceanographyOceanography

- new devices development for nuclear spectrometry of new devices development for nuclear spectrometry of environmental radioactivityenvironmental radioactivity for undersea station for undersea station GEOSTAR (Geophysical and Oceanographic Station for GEOSTAR (Geophysical and Oceanographic Station for Abyssal Research);Abyssal Research);

- Seawater samples analysis collected by GEOSTAR or Seawater samples analysis collected by GEOSTAR or oceanographic ships;oceanographic ships;

- Endogenous gas samples analysis.Endogenous gas samples analysis.

W. Plastino, M. Laubenstein, G. Etiope, P. Favali, W. Plastino, M. Laubenstein, G. Etiope, P. Favali, Environmental radioactivity analysis in sea-water samples collected by Environmental radioactivity analysis in sea-water samples collected by GEOSTAR deep-sea observatory,GEOSTAR deep-sea observatory, Laboratori Nazionali del Gran Sasso – I.N.F.N., Annual report 2002, 201-206, 2003. Laboratori Nazionali del Gran Sasso – I.N.F.N., Annual report 2002, 201-206, 2003.

G. Etiope, P. Favali, J.L. Fuda, F. Italiano, C. Millot, M. Laubenstein, W. Plastino, G. Etiope, P. Favali, J.L. Fuda, F. Italiano, C. Millot, M. Laubenstein, W. Plastino, The Benthic Boundary Layer: geochemical The Benthic Boundary Layer: geochemical and oceanographic data from the GEOSTAR-2 observatoryand oceanographic data from the GEOSTAR-2 observatory, Annals of Geophysics, submitted., Annals of Geophysics, submitted.


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Documents

THE LABORATORY FOR LOW-LEVEL RADIOACTIVITY MEASUREMENTS @ LNGS Matthias Laubenstein