核相交代

かくそうこうたい

noun

•

alternation of nuclear phases

核	nucleus, core, kernel
相	inter-, mutual, together, each other, minister of state, councillor, aspect, phase, physiognomy
交	mingle, mixing, association, coming & going
代	substitute, change, convert, replace, period, age, counter for decades of ages, eras, etc., generation, charge, rate, fee