1. Grup de Física de les Radiacions 24 th 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

2. 24 th ICNTS 0. 1. 2. 3. 4. 5. 2 Overview 1.The UAB PADC neutron dosimetry system 2.Dosemeter response 3.Measurements at EC-IRMM Van der Graaf facility 4.Results 5.Conclusions

3. 24 th ICNTS 0. 1. 2. 3. 4. 5. 3 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 Methacrylate (5 mm) Makrofol (300 μm) Polyethylene (3 mm) CR-39 (500 μm) Nylon (100 μm)

4. 24 th ICNTS 0. 1. 2. 3. 4. 5. 4 The UAB PADC neutron dosimetric system Process after irradiation 6 cm Cutting Electrochemical Etching

5. 24 th ICNTS 0. 1. 2. 3. 4. 5. 5 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 cm 2 Track density determination

6. 24 th ICNTS 0. 1. 2. 3. 4. 5. 6 Dosemeter response Expected behaviour  NRPB Report W25  R.J. Tanner et al.. Radit. Meas. 34 (2001) 457-461

7. 24 th ICNTS 0. 1. 2. 3. 4. 5. 7 Dosemeter response Calibration with ISO neutron sources and realistic fields at IRSN Cadarache (France) Source Type of field Mean Energy R Φ (neutron -1 ) R H p (10) (cm -2 ·mSv - 1 ) 241 Am-BeISO4.15 MeV(1.82 ± 0.13)×10 -4 450 ± 33 Bare 252 CfISO2.13 MeV(2.01 ± 0.13)×10 -4 591 ± 39 ( 252 Cf + D 2 O)/CdISO539 keV(5.55 ± 0.27)×10 -5 499 ± 24 252 Cf + D 2 OISO539 keV(5.17 ± 0.23)×10 -5 518 ± 23 SIGMARealistic79 keV(1.422 ± 0.064)×10 -5 575 ± 26

8. 24 th ICNTS 0. 1. 2. 3. 4. 5. 8 Dosemeter fluence response

9. 24 th ICNTS 0. 1. 2. 3. 4. 5. 9 Dosemeter H p (10.0º) response

10. 24 th ICNTS 0. 1. 2. 3. 4. 5. 10 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

11. 24 th ICNTS 0. 1. 2. 3. 4. 5. 11 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

12. 24 th ICNTS 0. 1. 2. 3. 4. 5. 12 Measurements at EC-IRMM Van der Graaf facility

13. 24 th ICNTS 0. 1. 2. 3. 4. 5. 13 Results 4 dosemeters per energy Background determined with 4 extra non-irradiated dosemeters Nominal Energy Target Mean Energy with BSS R Φ (neutron -1 ) R H p (10) (cm -2 ·mSv -1 ) 300 keVT(p.n) 3 He269 keV(4.13 ± 0.53)×10 -5 211 ± 27 800 keVT(p.n) 3 He662 keV(1.24 ± 0.16)×10 -4 371 ± 48 7.5 MeVD(d.n) 3 He7.53 MeV(8.95 ± 0.16)×10 -5 128 ± 24 16 MeVT(d.n) 4 He12.66 MeV(1.19 ± 0.15)×10 -4 198 ± 25

14. 24 th ICNTS 0. 1. 2. 3. 4. 5. 14 Results – Fluence response

15. 24 th ICNTS 0. 1. 2. 3. 4. 5. 15 Results – Dose response

16. 24 th ICNTS 0. 1. 2. 3. 4. 5. 16 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

17. 24 th ICNTS 0. 1. 2. 3. 4. 5. 17 Thanks for your attention!