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 definition of a ricochet is an act of bouncing off a surface. An example of a ricochet is a rubber ball flying back after hitting a wall. Ricochet is defined as to bounce off a surface and go another direction. An example of to ricochet is for a basketball to come flying back after hitting the backboard.