This article is about Aktinum. Californium isotopes with mass number from 237 to 256 are made in nuclear reactors.Californium-253 is β-radiation isotope and the rest is α-radiation isotope.Isotest elements (CF, CF and CF), which are even mass number, are likely to be spontaneous fission.In particular, CF has a 99.7%chance of voluntary fission.Californium-249 has a long half-life (352 years) and makes it possible to recognize low spontaneous fission and strong γ-radiation.CF is not made much in the nuclear reactor.Because it is not easy to make because of the slow β-collapse of BK before collapse and the large cross-sectional area when interacting with neutrons.However, due to the product of β-collapse of BK, it is accumulated as pure isotopes.Californium is made by plutonium reactor investigation.This is mainly the presence of CF and CF, which later become more pronounced by the influence of a large neutron, and the characteristics of this are inhibited by the strong neutron ship.
How many years is the half-life of Californium-249?
352