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.
When ratchet is used in hip hop, it can also mean cool, sloppy, sleek, or flashy. When Azealia Banks name-checks the word, as she often does on Twitter â âRatchet bitches make the world go aroundâ was one recent tweet â itâs hard to figure out exactly what she means, but it definitely has positive connotations.hile she recognizes that the expression, when used to describe a person, is often pejorative, she has also sees women embracing âratchet â¦ as an attempt to de-pathologize itâ and to celebrate both its edginess and its roots in the southern working class.