Abstract
MCNP5 program was used to investigate the neutron and gamma shielding properties of Ni-Ti- X Mo maraging steels. The MCNP5 program experimental setup was designed using neutrons of 14.1 MeV from sealed neutron tube and 60Co as a gamma ray source. Particular attention was given to the shielding properties of neutron and gamma for low nickel free cobalt, titanium containing modified maraging steel in correlation to the molybdenum as alloying element. Based on the shielding properties, Ni-Ti- X Mo maraging steels with different molybdenum content show the same shielding properties of neutron and gamma rays when compared to the standard maraging steel 18Ni (C250). In addition, the secondary gamma ray spectra due to neutron irradiation show no obvious difference between all steels under investigation. A comparison with available calculated and experimental results of the mass attenuation coefficient at gamma energies 1173 and 1332 keV for other steels has been done. From an economic point of view newly cobalt free low-nickel maraging steel is cheaper than standard C250 maraging steel as shielding materials.
Key words: Neutron shielding, gamma ray shielding, maraging steel, MCNP5 program.
