${.}_{92}^{238}U\stackrel{x_1}{\to }{.}_{90}^{234}Th\stackrel{x_2}{\to }{.}_{91}^{234}Pa\stackrel{x_3}{\to }{.}^{234}Z\stackrel{x_4}{\to }{.}_{90}^{230}Th$
$x_1,x_2,x_3,x_4$,
$x_1,x_2,x_3,x_4$, are either particles or radiation. Then

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