The rule is that a sample is safe when its radioactivity has dropped below detection limits. And that occurs at 10 half-lives. So, if radioactive iodine-131 (which has a half-life of 8 days) is injected into the body to treat thyroid cancer, itâll be âgoneâ in 10 half-lives, or 80 days.
The term 'ratchet' has no less than two distinct meanings. As an adjective, it describes a person, usually a woman, or activity, who is out of hand, out of control, generally whack in some way, dirty, ghetto, unattractive, Crucian, or just generally disliked.
A person who is easily duped, tricked, etc; patsy, sucker: a set-up, a tout's dream come true (1926+) A one-day jail sentence (1920s+ Underworld) glass, ice, soda, etc, to be mixed with liquor: They supplied the set-ups (1930+)