MCNP Simulated Gamma Flux from LUNL Source

Data is comma separated, with a header row. Columns are x, y, and z grid positions in centimetres, followed by the recorded flux and error estimate.

Data was recorded for an xy plane, mimicking the height where a sensor affixed to a ground robot would sample. The flux is energy integrated over 200 keV to 2500 keV, similar to the CeBr₃ detector used in robot deployment.

The simulation environment consists of an isotropic ²⁵²Cf source surrounded by water, an air gap, followed by a concrete outer layer. Gamma flux contributions come from the source directly (spontaneous fission spectrum), as well as activation of nearby materials.