plutonium presence; weapon-grade isotopic composition (i.e., the ratio of 240Pu to 239Pu is less than 0.1); and amount of plutonium is greater than a specified threshold mass.
是否存在钚； 武器级同位素构成(即，钚240和钚239之比小于0.1)；以及 钚的数量是否大于规定界限值。