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     97    

97 Bk Berkelium

Actinoid, mass: 247 u, no stable and no natural isotopes.

13 milligrams of berkelium 249, this here was used for the first creation of tenessine. Photo: Oak Ridge National Laboratory, public domain.

Berkelium

Berkelium is made from americium or curium, mostly unintentional, because outside of basic research it hasn't any application. The most stable isotope, 247Bk, has a half-life of 1380 years after all, but this is hardly produced. The most commonly accrued 249Bk has a half-life of only 330 days. Of this, each year about 1 gram emerges worldwide as by-product in nuclear reactors, most of it decays to californium. Berkelium is a strong β-emitter.


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