If all the mass was last as energy the Einstein's formula (Energy = Mass * The velocity of light in a vacuum squared) will give you the energy.
However in normal radioactive decay mass is also lost from the sample as alpha particle and beta particles, not energy.
2.25 x 10 15j
2.25 times 10 to the 15
4.5 × 1015 J
9 x 10^12 J
1..35 x 10^15
9 × 10^13 J
Radioactive material is warmer than the surrounding material because radioactive material is constantly breaking down. When material breaks down, that means that energy is constantly getting released. When energy is released, it produces warmth.
For radioactive dating to be possible, the sample must contain a measurable amount of a radioactive isotope with a known decay rate. The sample must be isolated from sources of contamination that could affect the accuracy of the dating. Additionally, the sample must have remained a closed system since the radioactive isotopes were incorporated, in order to accurately measure the decay products.
The activity of a radioactive sample is calculated using the formula: Activity = λ*N, where λ is the decay constant of the isotope and N is the number of radioactive nuclei present in the sample. The unit of activity is becquerel (Bq).
It tells what fraction of a radioactive sample remains after a certain length of time.
Iodine-131 has a half-life of about 8 days.
4.5 × 1015 J