The separated sorbent was analyzed for Cu, Co, and Cd content by the instrumental neutron activation analysis (INAA) using short time irradiation with epithermal neutrons
(i.e., in a Cd shielding).
The largest enhancements were seen in transmission experiments with epithermal neutrons
at resonances in nuclei A > 100.
A drop in the count of epithermal neutrons
and an increase in the number of cool neutrons would indicate the presence of hydrogen in the lunar "soil" (regolith).
The thermal neutron background component from the thermal and epithermal neutrons
multiply scattered on collimators will depend on the collimation system.