SIMULASI DESAIN PERISAI RADIASI MBE-LATEKS MENGGUNAKAN MCNP5 SIMULATION FOR RADIATION SHIELDING DESIGN OF EBM-LATEX USING MCNP5

SIMULATION FOR RADIATION SHIELDING DESIGN OF EBM-LATEX USING MCNP5. Radiation shielding design for EBM-Latex 300 keV/20 mA was simulated using MCNP5. The purpose of simulation is to obtain verification data through analitical radiation shielding design of EBM-latex. In MCNP5 simulation, it needs the accurate input in order to provide the best outcome. The inputs are the size and intensity of X- rays source, the geometry of radiation shielding and EBM component inside the shielding, the characteristics of the material being simulated.The input is to be modeled using the VISED (visual editor) programme. In this simulation the X-ray radiation source is in the form of thin square source which is located in the central of Ti window and emits radiation isotopically. Futhermore, the EBM components inside the radiation shielding is as disturbance of the emiting X-ray when it is traveling. The obeserved atenuation intensity is detected using 5 point detector of Tally F5 which is placed in direction of the thickness of Pb-shielding. The observed X-ray distribution on the surface of a certain shielding is detected by placing many detectors F5 on its outer surface. From the results of simulation and data analysis, it is obtained that the safety thickness value of Pb shielding in order to restrain the radiation exposure from EBM-Latex 300 keV/20 mA is higher than 2,5 cm. In addition to the data of the shielding thickness value, the simulation results also shows the index dosis rate on shielding surfaces. The index dosis rate on the shield surface of the XZ plane is 2,58 mrem/h and on the shield surface of the YZ plane is 2,88 mrem/h. The different value between the two shield surfaces is due to the effect of the placement position of EBM components in the X-rays radition shielding. Keyword: MCNP, X-ray radiation shielding, EBM-latex