The radioactive heavy metal
Polonium-210 (210Po), which killed
Alexander Litvinenko, the former Russian spy, has crashed into public awareness.
210Po is a rare radioactive metalloid that is chemically similar to tellurium and bismuth, and occurs in uranium ores. It was discovered by
Marie and Pierre Curie in
1898. Less than
100 grams are (claimed to be) manufactured each year and its principle industrial use is in
nuclear reactors to superheat water. A mere
100gm to simply superheat water. Really?
210Po is a highly radioactive and an extremely toxic element. Even in
milligram or
microgram amounts it is very hazardous and requires specialised equipment with strict handling procedures.
210Po does not penetrate the skin's epidermis and is not a threat so long as it remains
outside the body. A
milligram of
210Po emits
as much alpha radiation as about
5 grams of radium, and enough
gamma radiation to cause a blue glow in the air around it. The level of
210Po in American tobacco has
tripled in recent years, coinciding with the
increased use of
calcium phosphate fertilisers. The ores of calcium phosphate attract and accumulate uranium, which slowly releases radon gas. As radon decays, its electrically charged daughter products attach themselves to dust particles, which adhere to the sticky hairs on the underside of tobacco leaves. This leaves a deposit of radioactive polonium on the leaves.
The intense localised heat in the burning tip of a cigarette volatilises the radioactive metals. While cigarette filters can trap some tar and nicotinic chemical carcinogens, they are
ineffective against the radioactive vapours. The lungs of a chronic smoker wind up with a
radioactive lining, which actually emits radiation. Smoking two packs of cigarettes a day imparts a radiation dose by alpha particles of about
1,300 millirem per year. Consider: the
annual radiation dose to the average American from inhaled radon is
200 millirem.
210-Po is soluble and is circulated through the body to every tissue and cell in levels much higher than from residential radon. The
evidence is found in the
blood and urine of smokers. The circulating
210Po causes genetic damage and early death from diseases reminiscent of early radiological pioneers:
liver and
bladder cancer,
stomach ulcer,
leukaemia,
liver cirrhosis and
cardiovascular diseases. Allegedly, radioactivity rather than tar accounts for at least
90% of all smoking-related lung cancers. The
Centres for Disease Control concluded:
"Americans are exposed to far more
radiation from tobacco smoke
than from any other source."
“Chelators” (Greek: to claw) are synthetic drugs that are designed to attach to heavy metals and eliminate them from the body, but such drugs can themselves be quite toxic and also remove a portion of desirable minerals from the body.