Radioactive depleted uranium has a half-life of 4500 million years.
The FDA recommends keeping a fourteen-day supply on hand; radioactive iodine has a half-life of eight days.
At age 18, caffeine has a half-life of 4.5 hours, which increases with age.
Prealbumin, also known as transthyretin, has a half-life of only 1 to 2 days.
The small, lead-shielded canisters contain pellets or a fine powder of caesium 137, which emits powerful gamma radiation with a half-life of 30 years.
Frova may represent an important advancement in the treatment of migraine headache as no other currently marketed treatment has a half-life of more than six hours.
In addition, the plants would produce 7,313 tonnes of highly radioactive waste with a half-life of 24,000 years.
It stays in the body for a lifetime, it has a half-life of 28, 29 years and it gets into the bone, it's taken up just like calcium.
Tritium is radioactive, with a half-life of 12.26 years.
This constitutes the main long-term threat in the area as the chemical has a half-life of 30 years.