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TY - CONF AU - Azizpourian, S. AU - Abbasi Davani, F. AU - Afarideh, H. AU - Afkhami Karaei, M. AU - Mousavinia, M. ED - Chrin, Jan ED - Schaa, Volker RW TI - Simulation of Optimum Thickness and Configuration of 10 MeV Cyclotron Shield J2 - Proc. of Cyclotrons2016, Zurich, Switzerland, September 11-16, 2016 C1 - Zurich, Switzerland T2 - International Conference on Cyclotrons and Their Applications T3 - 21 LA - english AB - Baby Cyclotrons that made in Self-shield type have been employed for use in Medical center for the diagnosis of cancer diseases by positron emission tomography (PET) system. Here in we have done a discussion on gamma and neutron dose rates at a distance of one meter outside of the cyclotron shielding. This shield consist of Lead, polyethylene borated (10% Boron) layers from inside to outside respectively. With increasing the thickness of lead and polyethylene we will see a decrease in the gamma and neutron dose which received by the water phantom at a distance of one meter outside from the surface of the shield of the cyclotron. Note that the gamma and neutron dose at the beginning (without any shielding) was on the order of several thousand μSv per hour that by achieve to a certain amount of thickness of the shield, the dose was reduced to below of the limited level. In this study, the MCNPX Code has been used. In MCNPX Code that used the variance reduction techniques for decreasing relative errors of calculation which was a good method for this case study. PB - JACoW CP - Geneva, Switzerland SP - 110 EP - 113 KW - neutron KW - cyclotron KW - shielding KW - radiation KW - simulation DA - 2017/01 PY - 2017 SN - 978-3-95450-167-0 DO - 10.18429/JACoW-Cyclotrons2016-MOP22 UR - http://jacow.org/cyclotrons2016/papers/mop22.pdf ER -