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.
The term Ratchet is now used in excess by dumb, middle-class, white girls in an attempt to escape their mundane lives by pretending to be in touch with the Hood. These tween cum stains are under the impression that their generation has, yet again, created something new and hip. Little do they know, the term Ratched is merely the latest example of a high school drop out using a mixture of phonetics and ebonics to create cock-ups of legitimate English words.