Uranium 235

Concept of Uranium 235

In relation to securing dangerous material (in case of crisis or terrorism) a meaning of uranium 235 may be outlined, in general regarding European law, as follows: Naturally occurring uranium contains 0.72% of Uranium 235 (235U). It is used to fuel nuclear reactors (3-5 % enrichment typically) or to produce nuclear weapons (90% or more enrichment). 235U is the fissile isotope of uranium. It has a half-life of 703.8 million years.
See: Fissile Material[1]

Resources

Notes and References

1. Definition of uranium 235 published by the European Commission