<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (January 2009) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (January 2009) (Learn how and when to remove this template message) </Td> </Tr> <Table> Plutonium - 239 <Tr> <Td_colspan="2"> A 99.96% pure ring of plutonium </Td> </Tr> <Tr> <Th_colspan="2"> General </Th> </Tr> <Tr> <Th> Name, symbol </Th> <Td> Plutonium - 239, Pu </Td> </Tr> <Tr> <Th> Neutrons </Th> <Td> 145 </Td> </Tr> <Tr> <Th> Protons </Th> <Td> 94 </Td> </Tr> <Tr> <Th_colspan="2"> Nuclide data </Th> </Tr> <Tr> <Th> Half - life </Th> <Td> 24,110 years </Td> </Tr> <Tr> <Th> Parent isotopes </Th> <Td> Cm (α) Am (EC) Np (β) </Td> </Tr> <Tr> <Th> Decay products </Th> <Td> U </Td> </Tr> <Tr> <Th> Isotope mass </Th> <Td> 239.0521634 u </Td> </Tr> <Tr> <Th> Spin </Th> <Td> + ​ ⁄ </Td> </Tr> <Tr> <Th_colspan="2"> Decay modes </Th> </Tr> <Tr> <Th> Decay mode </Th> <Td> Decay energy (MeV) </Td> </Tr> <Tr> <Th> Alpha decay </Th> <Td> 5.156 </Td> </Tr> <Tr> <Td_colspan="2"> Complete table of nuclides </Td> </Tr> </Table> <Tr> <Td_colspan="2"> A 99.96% pure ring of plutonium </Td> </Tr>

How many grams of plutonium in a nuclear bomb