MCNP6.2 is a proprietary, export-controlled software package developed by Los Alamos National Laboratory (LLNL). It is to the general public. The software is classified as Export Control Classification Number (ECCN) 3D001 under the U.S. Department of Commerce regulations and falls under the jurisdiction of the U.S. Department of Energy (DOE). Acquisition requires a strict vetting process, a paid license (unless the user is a DOE employee/contractor), and adherence to non-proliferation protocols. "Free" versions found on third-party sites are likely illegal, unlicensed, or potential cybersecurity threats.
Tracks dozens of particle types across a massive range of energies.
Below is a comprehensive guide on how to legally and safely acquire MCNP6.2. ⚠️ Important Legal Warning
(Monte Carlo N-Particle) for his thesis on modular reactor shielding, but the official path through the Radiation Safety Information Computational Center (RSICC)
The "free" version he’d downloaded wasn't a cracked copy of the Los Alamos software. It was a botnet client
