<Tr> <Td> Activity (A) </Td> <Td> curie </Td> <Td> Ci </Td> <Td> 3.7 × 10 s </Td> <Td> 1953 </Td> <Td> 3.7 × 10 Bq </Td> </Tr> <Tr> <Td> becquerel </Td> <Td> Bq </Td> <Td> s </Td> <Td> </Td> <Td> SI </Td> </Tr> <Tr> <Td> rutherford </Td> <Td> Rd </Td> <Td> 10 s </Td> <Td> 1946 </Td> <Td> 1,000,000 Bq </Td> </Tr> <Tr> <Td> Exposure (X) </Td> <Td> röntgen </Td> <Td> </Td> <Td> esu / 0.001293 g of air </Td> <Td> 1928 </Td> <Td> 2.58 × 10 C / kg </Td> </Tr>

Which is the unit of measurement for radiation exposure