<Table> <Tr> <Th_colspan="2"> Little Boy </Th> </Tr> <Tr> <Td_colspan="2"> A post-war Little Boy model </Td> </Tr> <Tr> <Th> Type </Th> <Td> Nuclear weapon </Td> </Tr> <Tr> <Th> Place of origin </Th> <Td> United States </Td> </Tr> <Tr> <Th_colspan="2"> Production history </Th> </Tr> <Tr> <Th> Designer </Th> <Td> Los Alamos Laboratory </Td> </Tr> <Tr> <Th> Produced </Th> <Td> 1945 </Td> </Tr> <Tr> <Th> No. built </Th> <Td> 26 </Td> </Tr> <Tr> <Th_colspan="2"> Specifications </Th> </Tr> <Tr> <Th> Weight </Th> <Td> 9,700 pounds (4,400 kg) </Td> </Tr> <Tr> <Th> Length </Th> <Td> 10 feet (3.0 m) </Td> </Tr> <Tr> <Th> Diameter </Th> <Td> 28 inches (71 cm) </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Filling </Th> <Td> Uranium - 235 </Td> </Tr> <Tr> <Th> Filling weight </Th> <Td> 140 lb (64 kg) </Td> </Tr> <Tr> <Th> Blast yield </Th> <Td> 15 kilotons of TNT (63 TJ; 0.7 g mass equivalent) </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Little Boy </Th> </Tr>

How big is the atomic bomb that was dropped on hiroshima
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