# Resolve RDF Terms

quantitykind:FastFissionFactor
http://qudt.org/vocab/quantitykind/FastFissionFactor

### Recommended prefix

quantitykind:

lang:en
Fast Fission Factor
lang:""
http://en.wikipedia.org/wiki/Four_factor_formula
lang:""
http://www.iso.org/iso/catalogue_detail?csnumber=31895
lang:""
$$\varphi$$
lang:""
"Fast Fission Factor" in an infinite medium, is the ratio of the mean number of neutrons produced by fission due to neutrons of all energies to the mean number of neutrons produced by fissions due to thermal neutrons only.