11. Upon ingestion by rats, only about 0.01 % berkelium ends in the blood stream. 12. The maximum permissible amount of berkelium -249 in the human skeleton is 0.4 nanograms. 13. In total, just over one gram of berkelium -249 has been produced at Oak Ridge since 1967. 14. Berkelium metal can also be produced by the reduction of berkelium ( IV ) oxide with thorium or lanthanum.15. Berkelium metal can also be produced by the reduction of berkelium ( IV ) oxide with thorium or lanthanum. 16. The known oxyhalides of berkelium include BkOCl, BkOBr and BkOI; they all crystallize in a tetragonal lattice. 17. Berkelium ( III ) and berkelium ( IV ) hydroxides are both stable in 1 molar solutions of sodium hydroxide.18. Berkelium ( III ) and berkelium ( IV ) hydroxides are both stable in 1 molar solutions of sodium hydroxide. 19. In all these organs berkelium might promote cancer, and in the skeletal system its radiation can damage red blood cells. 20. Between 70 K and room temperature, berkelium behaves as a ionization potential of a neutral berkelium atom is 6.23 eV.
