TY - JOUR ID - 12831 TI - Monte Carlo calculation of shielding parameters for fast neutrons in newly developed heavy concretes JO - Iranian Journal of Medical Physics JA - IJMP LA - en SN - AU - Mesbahi, Asghar AU - Khaldari, Rezvan AD - Department of Medical Physics, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran. Tel+989141193747; Fax: +98 413 3364660; Email: mesbahiiran@yahoo.com, amesbahi2010@gmail.com AD - MSc Medical Physics, Radiotherapy center, Shafa Hospital, Kerman, Iran. Tel+989132415671; Email: r.khaldari@yahoo.com Y1 - 2018 PY - 2018 VL - 15 IS - Special Issue-12th. Iranian Congress of Medical Physics SP - 214 EP - 214 KW - Monte Carlo Method KW - Neutron radiation KW - Shielding KW - Radiation Therapy KW - Concrete DO - 10.22038/ijmp.2018.12831 N2 - Introduction: The role of radiotherapy as a part of cancer management increases every year around the world. Thus, Radiation protection in the design of radiotherapy rooms are of great importance.   Materials and Methods: In present study using Monte Carlo method, MCNPX code, fourteen types of developed high density concretes with densities ranging from 2.45 to 5.11 g were cm3 simulated and the neutron shielding properties of these heavy concretes with different thickness investigated. The dosimetry parameters were calculated. The neutron shielding performance of the developed heavy concrete samples are tested by using neutron spectra of Am-Be and 18 MeV photon beam of the Varian linac. Some results of simulation were compared with available published results.     Results: The results relate to neutron shielding indicated that chemical compositions, composing elements (heavy elements such as Pb, Fe and light elements including hydrogen) and amount of these elements in concrete have important role in attenuation, capture of neutron and neutron protection.   Conclusion: It was concluded that the elemental composition and hydrogen content contribute an important rule for neutrons attenuation. Therefore when concrete is used for neutrons shielding, the water content as crystallization water in mixing ores must be taken in consideration. UR - https://ijmp.mums.ac.ir/article_12831.html L1 - ER -