Fortunately we don't contain berkelium.
Any item has berkelium inside.
Berkelium is an artificial chemical element obtained by nuclear reactions; Bk exist also in the debris of nuclear explosions. For the preparation of Bk isotopes see the link below.
berkelium is synthetic
berkelium is american
Berkelium is extremely rare, radioactive and unstable; berkelium is not for sale.
Berkelium has the valences 3+ and 4+.
Berkelium has 97 electrons.
Berkelium has 97 electrons.
Berkelium is an artificial element.
Berkelium is not a commercial product.
Berkelium is a metal.
We haven't berkelium in the body.