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Neutron-induced fission; fission detector; neutron peak fluence; spark counter; track detectors.

Fission fragments and other charged particles leave tracks of permanent damage in most of the insulating solids. Damage track detectors are useful for personal dosimeters and for flux/dose determination of high-energy particles from accelerators or cosmic rays. A detector that has its principal response at nucleon energy above 50 MeV is provided by the fission of Bi-209. Neutrons produce the largest percentage of hadron dose in most high-energy radiation fields. In these fields, the neutron spectrum is typically formed by low-energy neutrons (evaporation spectrum) and high-energy neutrons (knock-on spectrum). We used Bi-fission detectors to measure neutron peak fluence and compared the result with the calculated value of neutron peak fluence. For the exposure to 100 MeV we have used the iThemba Facility in South Africa.

R K Jain¹ Ashok Kumar² N L Singh³ L Tommasino⁴ B K Singh⁵

1. Department of Physics, School of Basic & Applied Sciences, Shobhit University, Meerut 250 110, India
2. Department of Applied Science (Physics), Vidya College of Engineering, Meerut 250 010, India
3. Physics Department, M.S. University of Baroda, Vadodara 390 002, India
4. National Agency for Environment Protection and Technical Services, APAT, via V. Brancati-48, 00144, Rome, Italy
5. High Energy Physics Laboratory, Department of Physics, Banaras Hindu University, Varanasi 221 005, India

Published

March 2012

Manuscript received

31 May 2011

Manuscript revised

26 August 2011

Accepted

15 September 2011