Since its inception in 1962, RSICC has evolved into one of the world’s leading resources for a broad range of the best available nuclear computational tools and services. RSICC software and data collections provide in-depth coverage of radiation transport and safety topics encompassing, but not limited to:

Physics of the interaction of radiation with matter
Radiation production and sources
Criticality safety
Radiation protection and shielding
Radiation detectors and measurements
Shielding materials properties
Shields and shipping cask design
Radiation waste management
Radiological safety and assessment
Atmospheric dispersion and environmental dose
Radiation dose in medical applications
Space shielding applications



MCNP6.1.1 Beta Release

RSICC is pleased to announce the release of MCNP6.1.1 Beta from Los Alamos National Laboratory. It is recommended that MCNP6.1.1Beta not be used for production level calculations, because it does not have the same level of verification, validation and testing as MCNP 6.1, both in the evaluation of new features and existing feature interoperability, and testing on a wide variety of hardware and operating systems. However, if users wish to perform their own V&V, it is ultimately up to their careful consideration how these executables should be used. This release does have the same high level of confidence for the existing capabilities released in MCNP 6.1.

This release was created for users interested in testing the new capabilities that are mostly for homeland security and non-proliferation applications. The beta version does not include new capabilities for the criticality safety community, but does run significantly faster than the production version. The MCNP package available from RSICC contains the final production version of MCNP 5 and MCNP X, and the latest production version of MCNP 6, in addition to this beta release and the associated nuclear and atomic data.

Customers that have already obtained either the source or executable version of MCNP6.1 will only be sent a single DVD that contains the beta code. All other individuals will receive the full complement of codes as stated previously.




The Radiation Safety Information Computational Center (RSICC) is a Department of Energy Specialized Information Analysis Center (SIAC) authorized to collect, analyze, maintain, and distribute computer software and data sets in the areas of radiation transport and safety. RSICC resides in the Reactor and Nuclear Systems Division (RNSD) at Oak Ridge National Laboratory.