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.
Ratchet straps are typically made from a polyester fabric, which is strong, durable, and has very little stretch to keep large loads properly secured. Polyester webbing also resists damaging UV rays and most common chemicals, and because it absorbs very little water, it is resistant to mildew, mold, rotting, and shrinkage.