8 sentences with “radioactive”

There are three types of radioactive particles: alpha, beta and gamma.

Beta radioactive particles can penetrate about one centimetre into tissues, and damage can occur to the skin but not to internal organs, unless ingested or breathed in.

Alpha radioactive particles, because of their relatively large mass, can be stopped even by a sheet of paper and usually cannot penetrate the outer layer of dead skin cells.

The isotopes found in nature are mostly stable, but a few dozen are radioactive or radioisotopes, i.e. they spontaneously disintegrate with the emission of alpha, beta and gamma radiation.

Loneliness had always inspired fear in me, but all that time I sat unaccompanied in that hospital room while radioactive material was circulating through my brain to fight the tumour, I felt at peace.

On 2 April I went to the Montefiore Medical Centre. Over the next four days, 8,000 rads of radioactive material were pumped into my brain: a dose so high that visitors had to protect themselves behind a lead shield.

Excavations along a river valley on the edge of Kenya have revealed hundreds of fragments of skulls, teeth, vertebrae and phalanges, which radioactive potassium has been used to date back some two and a half million years.

Lead, for example, is the final element of the three naturally occurring radioactive families headed by uranium, actinium and thorium, but while uranium-derived lead has an atomic weight of 206, actinium- and thorium-derived lead weigh 207 and 208 respectively.