how digital autoradiography technique can be useful for d ...€¦ · how digital autoradiography...
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Titre du document ~ February 2016 ~ 1
How Digital Autoradiography technique
can be useful for D & D projects?
Pascal Fichet, Raphaël Haudebourg, CEA Saclay,
DPC/SEARS/LASE, France
17th February 2016
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 2
Outline
• LASE laboratory: Analytical Support to Facilities Laboratory
• Digital Autoradiography Technique
• Digital Autoradiography for Radionuclides Mapping
• Digital Autoradiography in support of sampling processes
• Conclusions
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 3
Outline
• LASE laboratory: Analytical Support to Facilities Laboratory
• Digital Autoradiography Technique
• Digital Autoradiography for Radionuclides Mapping
• Digital Autoradiography in support of sampling processes
• Conclusions
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 4
LASE Laboratory
Different characterization
techniques for low and intermediate
level wastes.
Destructive analysis (sample = 1 g)
Radiochemistry
Alpha, Gamma, LSC
Elemental analysis
In situ technique: Autoradiography
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 5
LASE Laboratory
Lots of Radwastes must be characterized
Innovations are required for in situ
techniques, for techniques allowing a
better sampling process
Destructive techniques need less than 1
g of sample for digestion process
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 6
Outline
• LASE laboratory: Analytical Support to Facilities Laboratory
• Digital Autoradiography Technique
• Digital Autoradiography for Radionuclides Mapping
• Digital Autoradiography in support of sampling processes
• Conclusions
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 7
DA Technique
Radiography
Autoradiography
Interests: H, C, S, … radionuclides difficult to measure
Source Detector
Detector
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 8
DA Technique
Sensitive side Plastic side
« Image » of radioactivity
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 9
DA Technique
Screens can be reused hundreds of time
(1) Screen initialization (2) Screen Deposit (3) Exposure
Time
(4) Screen withdrawn (6) Calculations (5) Screen scan
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 10
DA Technique
• Semi quantitative values are achievable.
• Repeatability corresponds only to few percents
Same H-3
analysis
0
1000
2000
3000
4000
5000
6000
0 500 1000 1500 2000
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 11
Outline
• LASE laboratory: Analytical Support to Facilities Laboratory
• Digital Autoradiography Technique
• Digital Autoradiography for Radionuclides Mapping
• Digital Autoradiography in support of sampling processes
• Conclusions
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 12
Radionuclides mapping
H-3 mapping requirement
High radioactivity Laboratories in
Facility 459 CEA, Saclay
3 laboratories (250
m2 each) must be
destroyed. After
historical study
characterization is
required.
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 13
Radionuclides mapping
1) Shutdown after the
period of research 2) Cleanup
5) Dismantling
3) Researches on the history of the facility
4) R&D required for initial state characterizations.
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 14
Radionuclides mapping
Ceiling Wall Floor
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 15
Radionuclides mapping
A grid corresponding to 70 screens
Radioactivity
image, here
C-14
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 16
Radionuclides mapping
100 % measurements is very difficult and not efficient when
considering geostatistical approach
35 zones were drawn
on concrete surface 1000 screens were
deposited on the floor
and located precisely
by using a telemeter.
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 17
Radionuclides mapping
All Autoradiography images are processed by a homemade software
Here image resolution corresponds to small square of 5 mm * 5 mm
X1, Y1, DLU1 X2, Y2, DLU2 X3, Y3, DLU3 ……
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 18
Radionuclides mapping
For the characterization: approximately
20 000 values processed
Variogram calculated
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 19
Radionuclides mapping
Kriging calculation Uncertainties
Tritium traces Only 20% investigated by
autoradiography
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 20
Outline
• LASE laboratory: Analytical Support to Facilities Laboratory
• Digital Autoradiography Technique
• Digital Autoradiography for Radionuclides Mapping
• Digital Autoradiography in support of sampling processes
• Conclusions
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 21
Sampling process
www.vwr.com
Classical sampling
process
by wipe tests =
problems for non
labile radioactivity
In Situ Samplings
Alpha spectrometers
Liquid Scintillation
Counting
Laboratory
measurements
In situ measurements by
Autoradiography
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 22
Sampling process
Sampling process for tritiated wastes
Destructive measurement of H-3 is done by pyrolysis followed by
Liquid Scintillation Counting (LSC)
Sample = 1 g
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 23
Sampling process
Rapid investigation of wipes containing Uranium traces
Only 3 wipes among 7 contained Uranium.
After studies with a destructive method: wipe digestion followed by alpha spectrometry and/or ICP-MS, detection limit was determined at 0.2 Bq/wipe for Uranium.
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 24
Sampling process
Core made of concrete
containing C-14
Activity on surface
Activity
in depth
Interesting
sampling
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 25
Sampling process
Graphite cores containing
C-14
4 small cores on the same screen
Calculations Homogeneity of the
contamination at a very low scale
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 26
Sampling process
Study of a resin located inside a
plastic tube containing I-129
Plastic
deposited on a
film for 15
minutes
Efficient
solution
for
sampling
process
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 27
Outline
• LASE laboratory: Analytical Support to Facilities Laboratory
• Digital Autoradiography Technique
• Digital Autoradiography for Radionuclides Mapping
• Digital Autoradiography in support of sampling processes
• Conclusions
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 28
Conclusions
• Autoradiography technique has been used for characterization of
Radwastes.
• The technique is efficient for radionuclides difficult to measure :
alpha and beta emitters
• Autoradiography is very sensitive to alpha > beta > gamma
• It allows characterizations to provide radionuclides mapping and
better sampling process.
• Semi quantitative values can be obtained.
• Researches are going on to improve the Autoradiography technique:
« Preliminary identification of α and β contaminations through Digital
Autoradiography » R Haudebourg, P Fichet
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How Digital Autoradiography Technique can be useful for D&D projects? ~ February 2016 ~ 29
Conclusions