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Half Life

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Half Life
In a pool of mortgages underlying a mortgage-backed security, the length of time it takes for half the aggregate principal to be repaid. A half life is normally about 12 years, but this may vary depending on how often homeowners refinance their mortgages (which pays off all principal at once). Half lives are calculated for mortgage-backed securities issued or guaranteed by Freddie Mac, Fannie Mae, and Ginnie Mae.
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It has a half life of 83 million years, much longer than the 24,000 years of Plutonium 239.
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The cited half life and citing half life attempt to capture this omission from the impact factor.
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Nevertheless, its long half life is also relevant because suddenly discontinuing SSRIs is known to produce both somatic and psychological withdrawal symptoms, a phenomenon known as "SSRI discontinuation syndrome".
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