Half life and radioactive dating
Alpha decay is usually restricted to the heavier elements in the periodic table.(Only a handful of nuclides with atomic numbers less than 83 emit an -particle.) The product of -decay is easy to predict if we assume that both mass and charge are conserved in nuclear reactions.
The half-life of a catalog is the day when half of the consumer responses to the mailing have been received.In finance, the half-life of a mortgage is the date when half of the principal amount has been paid.Because of the way that interest is pro-rated (as a proportion of the total, paid more towards the first part of the life of the mortgage), the mortgage half-life date is generally more distant than the chronological half-way point in the total life of the mortgage.In science, a half-life (also, as a noun, spelled half life ) is the amount of time it takes for half of a substance or entity to undergo some specified process.
For example, the half-life of a radioactive substance is the amount of time it takes for half of its atoms to decay, and the half-life of a drug is the amount of time it takes before half of the active elements are either eliminated or broken down by the body.
Electron capture leads to a decrease of one in the charge on the nucleus.