0.0625 of the original sample This could then be incorporated into other data. So, if the half-life is two days, four half-lives is 8 days. If a sample has a count rate of 3,200 Bq at the start ...
After emitting an alpha or beta particle, the nucleus will often still be ‘excited’ and will need to lose energy. It does this by emitting a high energy electromagnetic wave called a gamma ray ...