[ RadSafe ] open source ion interaction with matter code

[Jeff Terry]

Hi All, 

A friend of mine (astronomer) is looking for code similar to MCNP-X that will calculate the energy loss of ions as a function of distance traveled to the interaction with different materials. 

They have concerns about the licensing and use requirements of MCNP-X. 

I have only used MCNP-X and haven't really looked for other options. 

I thought that someone on the list may know of something that I can pass along to him. 

Thanks,

Jeff