Know of an open source Boltzmann solver for photon transport?

AI Thread Summary
Several groups have developed Boltzmann solvers for photon and neutron transport simulations, but there is a lack of publicly available open source code. The inquiry specifically seeks open source Boltzmann solvers, distinguishing them from Monte Carlo methods. There is also interest in non-commercially locked software that could be adapted for radiotherapy simulations using photon and electron cross section databases. Participants are encouraged to share any relevant projects or contacts that could assist in this endeavor. The goal is to find suitable software for applications in medical physics rather than nuclear engineering.
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Many groups have created Boltzmann solvers for photon/neutron transport simulations of reactors over the years - but has anyone released their code? I am specifically interested in Boltzmann solvers, not Monte Carlo based calculations. If you know of any open source projects, please let me know.

Of course if you know of a group with software that is not officially open source (but also not commercially locked), then we may instead be able to come up with some other agreement, so don't hesitate to point me in their direction.
 
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One note to add:

My intentions are to adapt the software for radiotherapy simulation applications using photon and electron cross section databases, so I will not be competing in the field of nuclear physics/engineering.
 

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