Monte Carlo code facilities to get CSR

The use of the mathematical modeling technique by the Monte Carlo method (MC) uses probabilistic functions and ^random numbers to perform calculations that simulate physical systems, such as the transport of radioactive particles. The determination of the first and second half values layers (HVL) for a given spectrum and a predefined distance tested the advantages and disadvantages of each code in solving a simple task. The results were consistent but discrepant between each one about 2.5 and 6%, and the conclusion is that the codes are powerful and user-friendly, requiring a few computer language knowledge. (author)