# Uranium

This article should collect some formulas (preferably, from WIkipedia) in order to interpret the news about nuclear disasters.

## Decay of Uranium

$$\mathrm{{}^{235}_{\ 92}U\xrightarrow[7,038 \times 10^8 \ a]{\alpha }{}^{231}_{\ 90}Th\xrightarrow[25,52 \ h]{\beta^-\ }{}^{231}_{\ 91}Pa\xrightarrow[3,276 \times 10^4 \ a]{\alpha }{}^{227}_{\ 89}Ac\xrightarrow[21,773 \ a]{ \beta^-\ }{}^{227}_{\ 90}Th\xrightarrow[18,718 \ j]{\alpha}{}^{223}_{\ 88}Ra\xrightarrow[11,434 \ j]{\alpha }{}^{219}_{\ 86}Rn}$$

$$\mathrm{{}^{238}_{\ 92}U\xrightarrow[4,468 \times 10^9 \ a]{\alpha }{}^{234}_{\ 90}Th\xrightarrow[24,1 \ j]{\beta^-\ } {}^{234m}_{\ 91}Pa\xrightarrow[1,17 \ min]{ \beta^-\ }{}^{234}_{\ 92}U\xrightarrow[2,445 \times 10^5 \ a]{\alpha }{}^{230}_{\ 90}Th\xrightarrow[7,7 \times 10^4 \ a]{\alpha }{}^{226}_{\ 88}Ra\xrightarrow[1600 \ a]{\alpha }{}^{222}_{\ 86}Rn}$$

## Decay of $$\rm ^{232}_{\ 90}Th$$

$$\mathrm{{}^{232}_{\ 90}Th\xrightarrow[1,41 \times 10^{10}\ ans]{\alpha}{}^{228}_{\ 88}Ra\xrightarrow[5,75 \ ans]{\beta^-\ }{}^{228}_{\ 89}Ac\xrightarrow[6,13 \ h]{\beta^-\ }{}^{228}_{\ 90}Th\xrightarrow[1,91 \ ans]{\alpha}{}^{224}_{\ 88}Ra\xrightarrow[3,62 \ jours]{\alpha}{}^{220}_{\ 86}Rn}$$