Neutron Yield per Absorption
The "Neutron Yield per Absorption" is the average number of fission neutrons, both prompt and delayed, emitted per neutron absorbed in a fissionable nuclide or in a nuclear fuel, as specified.
Applicable units are those of quantitykind:NeutronYieldPerAbsorption
http://en.wikipedia.org/wiki/Fission_product_yield
The "Neutron Yield per Absorption" is the average number of fission neutrons, both prompt and delayed, emitted per neutron absorbed in a fissionable nuclide or in a nuclear fuel, as specified.
http://www.iso.org/iso/catalogue_detail?csnumber=31895