Is Polonium-210 a Good Indicator for Anthropogenic Radioactivity?
Résumé
Anthropogenic radioactivity generated by nuclear or chemical events results in the liberation of quadrillions of Becquerel and tons of materials to the environment. These events include nuclear accidents, nuclear weapon experiments, and high levels of generated radioactive and chemical waste. Po-210 is a high-energy alpha emitter that presents in the environment at extremely low concentration. It is considered as one of the highly toxic elements and is estimated to contribute about 7% of the total effective dose equivalent to humans from ingested natural internal radiation. The assessment of Po-210 activity/concentration in the environment could be used as an indicator of the level of anthropogenic radioactivity. The Po-210 concentration present in the most frequently sold cigarette produced in Lebanon was assayed using alpha spectrometry after a radiochemical separation and spontaneous deposition of Po on a copper disk. Although the geographical nature of Lebanese land is an extension of Syrian territory, the polonium activity concentration obtained is 8.8 times higher and attributable to the excessive use of phosphate fertilizers in agriculture. The individual committed effective dose was estimated to be equal to 219 +/- 17 mu Sv/year of cigarette smoking.
