Assertion: berkelium's isotope | /r/AtLocation | nuclear reaction
Facets:
value: between uranium-238
type: LOCATION
Source sentences:
text: Meanwhile, isotopes of element 99 (as well as of new element 100, fermium) were produced in the Berkeley and Argonne laboratories, in a nuclear reaction between nitrogen-14 and uranium-238, and later by intense neutron irradiation of plutonium or californium: