For Half Life we have terms and definitions in 6 topics. The topics are Chemistry, Dairy Production, Frauds and Scams, Investing, Nutrition and Prostate Cancer.

Half Life (Chemistry)

The amount of time it takes for half an initial amount to disintegrate.

Half Life (Dairy Production)

A term used to describe decay of radioactivity; the half life is that period of time in which the rate of emission of radioactivity is reduced by half.

Half Life (Frauds and Scams)

Point in time when the principal on a mortgage backed security (issued or guaranteed by the Government National Mortgage Association, the Federal National Mortgage Association, or the Federal Home Loan Mortgage Association) has been repaid. It is presumed that the security has a half life of 12 years. However, depending on interest rate trends, specific mortgage pools can have longer or shorter half lives. If interest rates rise, homeowners will hold onto their mortgages longer than predicted, and half lives will rise. If interest rates fall, more homeowners will refinance their mortgages. Thus, principal will be paid off more quickly, and half lives will drop.

Half Life (Investing)

Point in time when the principal on a mortgage backed security (issued or guaranteed by the Government National Mortgage Association, the Federal National Mortgage Association, or the Federal Home Loan Mortgage Association) has been repaid. It is presumed that the security has a half life of 12 years. However, depending on interest rate trends, specific mortgage pools can have longer or shorter half lives. If interest rates rise, homeowners will hold onto their mortgages longer than predicted, and half lives will rise. If interest rates fall, more homeowners will refinance their mortgages. Thus, principal will be paid off more quickly, and half lives will drop.

See Also: Federal National Mortgage Association; Government National Mortgage Association; Principal

Half Life (Nutrition)

The time it takes for half the amount of a drug to be metabolized or inactivated (disappear from the bloodstream) by the body (an important consideration for determining the amount and frequency of drug dosage).

Half Life (Prostate Cancer)

The time it takes for half of the nuclei of a radioactive substance to decay

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