Gamma rays shield for a reactor

Hi,
Is it currently possible to design a gamma-ray shield for a nuclear reactor using OpenMC?

According to the discussion in the link below, it was not feasible two years ago:
Gamma radiation from fission - User Support - OpenMC

I would like to know if OpenMC has since gained this capability and whether the results it produces are considered reliable. Additionally, I would greatly appreciate it if you could provide references to any relevant benchmark papers.

Thank you!