Simulation of dose around radioactive source by Monte Carlo method

Calculating the dose around radioactive source by simulation is an important way of radiation analysis and application. It is widely used in engineering. The paper uses a simple decay cascade to analyze the Pu-238 source, and obtains the varying trends of atomic number and activity for the source and its daughters. In view of the above-mentioned situation, it sets up an elaborate model by MCNP code, calculating the radioactive field and the problem about shield and getting the gamma and neutron energy spectra around the source. The result agrees with the reference, the shield used can reduce the dose effectively. Concretely, the dose of gamma is reduce to about 0.1%, and the neutron, 13%~17%.