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Track etch based LET spectrometry in beams of neutrons with energies from 0.2 to 200 MeV

Track etch based LET spectrometry in beams of neutrons with energies from 0.2 to 200 MeV. Brabcová Kateřina Spurn ý F ranti šek Jadrníčková Iva Department o f Radiation Dosimetry, Nuclear Physics Institute, Academy of Sciences of the Czech Republic, Prague , spurny@ujf.cas.cz. content.

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Track etch based LET spectrometry in beams of neutrons with energies from 0.2 to 200 MeV

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  1. Track etch based LET spectrometry in beams of neutrons with energies from 0.2 to 200 MeV Brabcová Kateřina Spurný František Jadrníčková Iva Department of Radiation Dosimetry, Nuclear Physics Institute, Academy of Sciences of the Czech Republic, Prague, spurny@ujf.cas.cz

  2. content • briefly about neutron dosimetry • track etched detectors (TED) • conditions of our experiments • results • conclusion

  3. about neutron dosimetry • indirectly ionizing radiation, energy transferred through the kinetic energy of secondary charged particles • large spectrum of the secondary particles created in detector or around • LET spectra should be known

  4. experimental methods of LET spectrometry • tissue-equivalent proportional counters, bubble detectors, nuclear emulsions, • in case of long exposure, limitation in weight and dimension, presence of intense low LET radiation : track etched based LET spectrometers

  5. TED generally • mostly polyallyldiglycolcarbonate C12H18O • evaluation by etching • measuring of track parameters • calibration etch rate of damaged material etch ratio etch rate of unaffected material

  6. our TED • polyallyldiglycolcarbonate C12H18O Page, 0.5 mm (Page Moulgings Ltd, England) Tastrak, 0.5 mm (Track Analysis Systems Ltd, Bristol) • evaluation by etching 5 M NaOH at 70oC for 18 hours • measuring of track parameters automatic optical image analyzer LUCIA G • calibration

  7. calibration of TED • heavy charged particle beams 12C – 84Kr LET from 7.5 to 600 keV/μm • performed in cooperation with HIMAC (NIRS Chiba, Japan) in the frame of ICCHIBAN programs – ICCHIBAN 2, 4, 6, and 8 NASA Space Radiation Laboratory (Brookhaven National Laboratory) in the frame of ICCHIBAN BNL Nuclotron of the Laboratory of High Energies, JINR, Dubna

  8. experiment EC-JRC • done at the Van de Graaff facility at the EC-JRC, Geel • quasi mono-energetic neutron beams produced by protons and deuterons • 7 different energies of neutron beams from 200 keV to 20 MeV • reference values – neutron fluences and neutron spectra, ambient dose equivalent H*(10)

  9. experiment iThemba • done in iThemba laboratory, Cape Town • quasi mono-energetic neutron beams produced by deuterons and Li targets • 2 energies of neutron beams – 100 and 200 MeV • reference values – neutron fluences and neutron spectra, ambient dose equivalent H*(10)

  10. experiment EC-JRC ?

  11. experiment EC-JRC recoil protons up to 100 keV.μm-1

  12. experiment EC-JRC

  13. experiment EC-JRC

  14. experiment EC-JRC (n,x)X

  15. experiment EC-JRC

  16. experiment EC-JRC

  17. experiment EC-JRC

  18. experiment EC-JRC recoil protons up to 100 keV.μm-1

  19. experiment EC-JRC

  20. experiment EC-JRC

  21. experiment EC-JRC (n,x)X

  22. experiment EC-JRC

  23. experiment EC-JRC

  24. experiment iThemba

  25. experiment iThemba

  26. dosimetric characteristic HLET= ∫ (dN / dLET) . LET . Q(LET) . dLET dose equivalent due to registered particles dN/dLET – number of tracks N in a LET interval dLET Q(LET) – ICRP 60 quality factor H*(10) ambient dose equivalent (reference value)

  27. conclusion • TED provides new information about neutron energy transfer to the matter • dose equivalent of secondary particles is lower than ambient dose equivalent H*(10) • intention of futher studies experiment with another neutron energies deal with unexpected values of 200 keV and 7 MeV

  28. Acknowledgements • Part of study has been realised in the frame of ESA DOBIES project. We are obliged to Filip Vanhavere (SCK MOL, Belgium) for the coordination of the project, and to ESA Prodex Office for financial assistance. • Many of results presented in this contribution were obtained by using the results of ICCHIBAN research project using heavy Ions at HIMAC-NIRS, NSRL–BNL, nuclotron JINR Dubna. We are much obliged to the staff of all laboratories and, particularly, to organizers of the run, Y. Uchihori, N. Yasuda, J. Miller, E.R. Benton, A.G. Molokanov, and V.P. Bamblevski† for their help. • Studies were also partially supported through the grant No. 202/04/0795 of the GA CR and the IRP AV0Z10480505.

  29. Thank you!

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