Journal of Nuclear Science, Engineering and Technology (JONSAT)
In cooperation with the Iranian Nuclear Society

Simulation of Neutron Streaming through Labyrinth of the Shield of Thallium Target Room of Cyclotron “Cyclone 30” using MCNP Computer Code

Document Type : Research Paper

Authors

G Raisali
N Hajilo
S Hamidi
G Aslani
Abstract
Thallium-201 is one of the medical radioisotopes produced in Nuclear Research Center for Agriculture and Medicine via 203Tl (p, 3n) 201Pb reaction, using protons from cyclotron Cyclone 30. Due to high intensity of the neutrons produced from the thallium target and its copper substrate, protection against this radiation is a necessity. The radiation shield is the concrete walls of the target room accessible from outside through a multi-bend maze. In this work, we have calculated the streaming of neutrons through the maze of the target room using MCNP Monte Carlo radiation transport code. The target has been bombarded with 145 µA of 28.5 MeV protons. Equivalent dose rate of neutrons in various positions in the maze has been calculated and compared with the measured values. The maximum deviation between the calculated and measured values is found to occur at the farthest position from the source, namely at the entrance door of the maze, for which the neutron equivalent dose has been calculated as 93 mSv/hr and the corrected measured value upon using the energy spectrum weighted correction factor is 136 mSv/hr. These values are in good agreement with each other according to the shielding point of view.  

Highlights

    1. K. Tesch, “The attenuation of the neutron dose equivalent in a labyrinth through an accelerator shield,” Partticle Accelerators 12, 169-175 (1982).

       

    2. F. Masukawa, “Analyses of high energy neutron streaming experiments using DUCT-ΙΙΙ,” Journal of Nuclear Science and Technology, Supplement2, 1268-1271 (2002).

       

    3. Bhaskar Mukherjee and Simon Parcell; “Transmission of neutron and gamma Radiation field along the maze of a cyclotron vault” Appl. Radiat. Isot. 48 (4), 453-457 (1997).

       

    4. J. F. Briesmeister; “N-Particle Transport Code,” Version 4A. Manual LA-12625-M (1993).

       

       

    5. NCRP, “American National Standard,” NCRP Report 33. ANSI / ANS-6.1.1 (1977).

       

    6. غلامرضا رئیس‌علی، سعید حمیدی، ناهید حاجیلو، غلامرضا اصلانی، ”تعیین شدت و بیناب نوترون‌های حـاصل از بمبـاران هدف تالیوم با زیرلایه مسی با پروتون‌های MeV‌ 5/28،“ مجموعه مقـالات دهـمین گردهمـایی فیزیک‌دانان و متخـصصـان هستـه‌ای

      کشور، دانشگاه اراک، 140-146 (اسفند ماه 1382).

       

    7. EG&G Berthold, “Operating Manual Neutron Probe LB6411”  Id. No. 1-20188-82042 BA2 Rev. No. 01 (1996).

     

    K. Tesch, “The attenuation of the neutron dose equivalent in a labyrinth through an accelerator shield,” Partticle Accelerators 12, 169-175 (1982).

     

F. Masukawa, “Analyses of high energy

Keywords

thallium-201
radiation shield
backscattered neutrons
monte carlo method
MCNP code
radiation streaming
computer simulation
cyclone 30

  1. K. Tesch, “The attenuation of the neutron dose equivalent in a labyrinth through an accelerator shield,” Partticle Accelerators 12, 169-175 (1982).

     

  2. F. Masukawa, “Analyses of high energy neutron streaming experiments using DUCT-ΙΙΙ,” Journal of Nuclear Science and Technology, Supplement2, 1268-1271 (2002).

     

  3. Bhaskar Mukherjee and Simon Parcell; “Transmission of neutron and gamma Radiation field along the maze of a cyclotron vault” Appl. Radiat. Isot. 48 (4), 453-457 (1997).

     

  4. J. F. Briesmeister; “N-Particle Transport Code,” Version 4A. Manual LA-12625-M (1993).

     

     

  5. NCRP, “American National Standard,” NCRP Report 33. ANSI / ANS-6.1.1 (1977).

     

  6. غلامرضا رئیس‌علی، سعید حمیدی، ناهید حاجیلو، غلامرضا اصلانی، ”تعیین شدت و بیناب نوترون‌های حـاصل از بمبـاران هدف تالیوم با زیرلایه مسی با پروتون‌های MeV‌ 5/28،“ مجموعه مقـالات دهـمین گردهمـایی فیزیک‌دانان و متخـصصـان هستـه‌ای

    کشور، دانشگاه اراک، 140-146 (اسفند ماه 1382).

     

7. EG&G Berthold, “Operating Manual Neutron Probe LB6411”  Id. No. 1-20188-82042 BA2 Rev. No. 01 (1996).

 

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