Ułóż równania:
227/90 Th ---α----> 4/2 He + 223/88 Ra
223/87 Fr ----β----> 0/-1 e + 223/88 Ra
215/85 At ----α----> 4/2 He + 211/83 Bi
210/83 Bi -----β----> 0/-1 e + 210/84 Po
₉₀²²⁷Th--->₈₈²²³Ra + ₂⁴He
₈₇²²³Fr-->₈₈²²³Ra + ₋₁⁰e
₈₅²¹⁵As-->₈₃²¹¹Bi + ₂⁴He
₈₃²¹⁰Bi-->₈₄²¹⁰Po + ₋₁⁰e
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227/90 Th ---α----> 4/2 He + 223/88 Ra
223/87 Fr ----β----> 0/-1 e + 223/88 Ra
215/85 At ----α----> 4/2 He + 211/83 Bi
210/83 Bi -----β----> 0/-1 e + 210/84 Po
₉₀²²⁷Th--->₈₈²²³Ra + ₂⁴He
₈₇²²³Fr-->₈₈²²³Ra + ₋₁⁰e
₈₅²¹⁵As-->₈₃²¹¹Bi + ₂⁴He
₈₃²¹⁰Bi-->₈₄²¹⁰Po + ₋₁⁰e