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CALIBRATION OF THE UAB PADC BASED NEUTRON DOSEMETER. Measurements in quasi-monoenergetic neutron beams at the EC-IRMM Van der Graaf accelerator. C. Domingo. M.J. García-Fusté. K. Amgarou. E. Morales and J. Castelo. Overview. The UAB PADC neutron dosimetry system Dosemeter response - PowerPoint PPT Presentation
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Grup de Física de les Radiacions24th International Conference on
Nuclear Tracks in Solids
CALIBRATION OF THE UAB PADC BASED NEUTRON DOSEMETER
Measurements in quasi-monoenergetic neutron beams at the EC-IRMM Van der Graaf accelerator
C. Domingo. M.J. García-Fusté. K. Amgarou. E. Morales and J. Castelo
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Overview
1. The UAB PADC neutron dosimetry system
2. Dosemeter response
3. Measurements at EC-IRMM Van der Graaf facility
4. Results
5. Conclusions
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The UAB PADC neutron dosimetric system
PADC neutron detector: CR-39
Converters: Rich in H. fast neutron
interaction Nylon rich in N. high
cross section for thermal neutrons
Wrapped in Climafol pouches
Dosemeter configuration
6 cm
6 cm
Methacrylate (5 mm)
Makrofol (300 μm)
Polyethylene (3 mm)
CR-39 (500 μm)
Nylon (100 μm)
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The UAB PADC neutron dosimetric system
Process after irradiation
6 cm
6 c
m
Cutting
Electrochemical Etching
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The UAB PADC neutron dosimetric system
Typical track diameters of 100 μm
Semi-automatic counting system Sony camera ImageJ analysis
software Scanned area: 0.53 cm2
Track density determination
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Dosemeter response Expected behaviour
NRPB Report W25 R.J. Tanner et al.. Radit. Meas. 34 (2001) 457-461
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Dosemeter response
Calibration with ISO neutron sources and realistic fields at IRSN Cadarache (France)
SourceType of
field
Mean
EnergyRΦ
(neutron-1)
RHp(10)
(cm-2·mSv-1)
241Am-Be ISO 4.15 MeV (1.82 ± 0.13)×10-4 450 ± 33
Bare 252Cf ISO 2.13 MeV (2.01 ± 0.13)×10-4 591 ± 39
(252Cf + D2O)/Cd ISO 539 keV (5.55 ± 0.27)×10-5 499 ± 24252Cf + D2O ISO 539 keV (5.17 ± 0.23)×10-5 518 ± 23
SIGMA Realistic 79 keV (1.422 ± 0.064)×10-5 575 ± 26
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Dosemeter fluence response
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Dosemeter Hp(10.0º) response
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Measurements at EC-IRMM Van der Graaf facility
EC NUDAME program
Quasi-monoenergetic neutron fields from few hundreds keV to 20 MeV
New energies for dosemeter calibration
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Measurements at EC-IRMM Van der Graaf facility
Neutron energies used:
300 keV. 800 keV.
7.5 MeV and 16 MeV Methacrylate phantom
used BSS spectrometry for
determination of neutron spectrum and H*(10) reference value at each irradiation point
Neutron beams and methods
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Measurements at EC-IRMM Van der Graaf facility
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Results
4 dosemeters per energy Background determined with 4 extra non-irradiated dosemeters
Nominal
EnergyTarget
Mean Energy
with BSSRΦ
(neutron-1)
RHp(10)
(cm-2·mSv-1)
300 keV T(p.n)3He 269 keV (4.13 ± 0.53)×10-5 211 ± 27
800 keV T(p.n)3He 662 keV (1.24 ± 0.16)×10-4 371 ± 48
7.5 MeV D(d.n)3He 7.53 MeV (8.95 ± 0.16)×10-5 128 ± 24
16 MeV T(d.n)4He 12.66 MeV (1.19 ± 0.15)×10-4 198 ± 25
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Results – Fluence response
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Results – Dose response
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Conclusions
The knowledge of the dosemeter response have been expanded with new energies
An important decrease of the response in the epithermal region has been confirmed
… to be done New values at thermal and low epithermal
regions should be obtained to complete the dosemeter response function
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Thanks for your attention!