Radium and radon in the environment

Average radon levels in homes

Radium and radon are important contributors to environmental radioactivity. Radon occurs naturally in the environment as a result of decay of radioactive elements in the soil and it can accumulate in houses built on areas where such decay occurs. This radon is among major causes of cancer, estimated to contribute to about 2% of all cancer related deaths in Europe.[1]

Radium, like radon, is a radioactive element and it is found in small quantities in nature and may thus be hazardous to life if concentrated. Radium has its origins as a decay product of certain isotopes of uranium and thorium.[2] Radium may also be released to the environment as a result of human activity, for example, in inproperly discarded products painted with radioluminescent paint.

Radium

Radium in alternative medicine

Eben Byers was a wealthy American socialite whose death in 1932 as a result of using an alternative medicine product called Radithor is a prominent example of a death caused by radium. Radithor contained approximately 1 μCi (40 MBq) of 226Ra and 1 μCi of 228Ra per bottle. Radithor was taken by mouth and radium, being a calcium mimic, has a very long biological halflife in bone.[3]

Radium in the oil and gas industries

Residues from the oil and gas industry often contain radium and its daughters. The sulfate scale from an oil well can be very radium rich. It is the case that the water inside an oil field is often very rich in strontium, barium and radium while seawater is very rich in sulfate so if water from an oil well is discharged into the sea or mixed with seawater the radium is likely to be brought out of solution by the barium/strontium sulfate which acts as a carrier precipitate.[4]

Glow in the dark products (radioluminescent)

Local contamination from radium-based radioluminescent paints having been improperly disposed of is not unknown.[5]

Radon

The majority of the dose is caused by the decay of the polonium (218Po) and lead (214Pb) daughters from 222Rn. By controlling exposure to the daughters the radioactive dose to the skin and lungs can be reduced by at least 90%. This can be done by wearing a dust mask, and wearing a suit to cover the entire body. Note that exposure to smoke at the same time as radon and radon daughters will increase the harmful effect of the radon. In uranium miners radon has been found to be more carcinogenic in smokers than in non-smokers.[4]

Uranium series
The radium or uranium series.

Occurrence of radon

Radon concentration in the open air varies between 1 and 100 Bq per cubic metre.[6] Radon can be found in some spring waters and hot springs.[7] The towns of Misasa, Japan, and Bad Kreuznach, Germany boast radium-rich springs which emit radon, as does Radium Springs, New Mexico.

Radon exhausts naturally from the ground, particularly in certain regions, especially but not only regions with granitic soils. Not all granitic regions are prone to high emissions of radon, for instance while the rock which Aberdeen is on is very radium rich the rock lacks the cracks required for the radon to migrate. In other nearby areas of Scotland (to the north of Aberdeen) and in Cornwall/Devon the radon is very much able to leave the rock.

Radon is a decay product of radium which in turn is a decay product of uranium. It is possible to acquire maps of average radon levels in houses to assist in the planning of radon mitigation measures for homes.[8]

Note that while high uranium in the soil/rock under a house does not always lead to a high radon level in air, a positive correlation between the uranium content of the soil and the radon level in air can be seen.

Radon in air

Radon is related to indoor air quality as it blights many homes. (See "Radon in Houses" below.)

The radon (222Rn) released into the air decays to 210Pb and other radioisotopes and the levels of 210Pb can be measured. It is important to note that the rate of deposition of this radioisotope is very dependent on the season. Here is a graph of the deposition rate observed in Japan.[9]

Lead-210 deposition rate as a function of time as observed in Japan

Radon in groundwater

Well water can be very rich in radon; the use of this water inside a house is an additional route allowing radon to enter the house. The radon can enter the air and then be a source of exposure to the humans, or the water can be consumed by humans which is a different exposure route.[10]

Radon in rainwater

Rainwater can be intensely radioactive due to high levels of radon and its decay progenies 214Bi and 214Pb; the concentrations of these radioisotopes can be high enough to seriously disrupt radiation monitoring at nuclear power plants.[11] The highest levels of radon in rainwater occurs during thunderstorms, and it is hypothesized that radon is concentrated in thunderstorms on account of the atom's positive electrical charge.[12] Estimates of the age of rain drops have been obtained from measuring the isotopic abundance of radon's short-lived decay progeny in rainwater.[13]

Radon in the oil and gas industries

The water, oil and gas from a well often contains radon. The radon decays to form solid radioisotopes which form coatings on the inside of pipework. In an oil processing plant the area of the plant where propane is processed is often one of the more contaminated areas of the plant as radon has a similar boiling point to propane.[14]

Radon in mines and caves

Because uranium minerals emit radon gas, and their harmful and highly radioactive daughter products, uranium mining is considerably more dangerous than other (already dangerous) hard rock mining, requiring adequate ventilation systems if the mines are not open pit. During the 1950s, a significant number of American uranium miners were Navajo Indians, as many uranium deposits were discovered on Navajo reservations. A statistically significant subset of these miners later developed small-cell lung cancer, a type of cancer usually not associated with smoking, after exposure to uranium ore and radon-222, a natural decay product of uranium.[15] The radon, which is produced by the uranium, and not the uranium itself has been shown to be the cancer causing agent.[16] Some survivors and their descendants received compensation under the Radiation Exposure Compensation Act in 1990.

Currently the level of radon in the air of mines is normally controlled by law. In a working mine, the radon level can be controlled by ventilation, sealing off old workings and controlling the water in the mine. The level in a mine can go up when a mine is abandoned, it can reach a level which is able to cause the skin to become red (a mild radiation burn). The radon levels in some of the mines can reach 400 to 700 kBq m−3.[17]

A common unit of exposure of lung tissue to alpha emitters is the working level month (WLM), this is where the human lungs have been exposed for 170 hours (a typical month worth of work for a miner) to air which has 3.7 kBq of 222Rn (in equilibrium with its decay products). This is air which has the alpha dose rate of 1 working level (WL). It is estimated that the average person (general public) is subject to 0.2 WLM per year, which works out at about 15 to 20 WLM in a lifetime. According to the NRC 1 WLM is a 5 to 10 mSv lung dose (0.5 to 1.0 rem), while the Organisation for Economic Co-operation and Development (OECD) consider that 1 WLM is equal to a lung dose of 5.5 mSv, the International Commission on Radiological Protection (ICRP) consider 1 WLM to be a 5 mSv lung dose for professional workers (and 4 mSv lung dose for the general public). Lastly the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) consider that the exposure of the lungs to 1 Bq of 222Rn (in equilibrium with its decay products) for one year will cause a dose of 61 μSv.[18]

In humans a relationship between lung cancer and radon has been shown to exist (beyond all reasonable doubt) for exposures of 100 WLM and above. By using the data from several studies it has been possible to show that an increased risk can be caused by a dose as low as 15 to 20 WLM. Sadly these studies have been difficult as the random errors in the data are very large. It is likely that the miners are also subject to other effects which can harm their lungs while at work (for example dust and diesel fumes).

Radon in houses

The fact that radon is present in indoor air has been known at least since 1950s and research on its effects on human health started on early 1970s.[19] The danger of radon exposure in dwellings received more widespread public awareness after 1984, as a result of a case of Stanley Watras, an employee at the Limerick nuclear power plant in Pennsylvania.[20] Mr. Watras set off the radiation alarms (see Geiger counter) on his way into work for two weeks straight while authorities searched for the source of the contamination. They were shocked to find that the source was astonishingly high levels of radon in his basement and it was not related to the nuclear plant. The risks associated with living in his house were estimated to be equivalent to smoking 135 packs of cigarettes every day.[21]

Depending on how houses are built and ventilated, radon may accumulate in basements and dwellings. The European Union recommends that mitigation should be taken starting from concentrations of 400 Bq/m3 for old houses, and 200 Bq/m3 for new ones.[22]

The National Council on Radiation Protection and Measurements (NCRP) recommends action for any house with a concentration higher than 8 pCi/L (300 Bq/m³).

The United States Environmental Protection Agency recommends action for any house with a concentration higher than 148 Bq/m3 (given as 4 pCi/L). Nearly one in 15 homes in the U.S. has a high level of indoor radon according to their statistics. The U.S. Surgeon General and EPA recommend all homes be tested for radon. Since 1985, millions of homes have been tested for radon in the U.S.[22]

By adding a crawl space under the ground floor, which is subject to forced ventilation the radon level in the house can be lowered.[23]

References

  1. ↑ Darby; et al. (January 29, 2005). "Radon in homes and risk of lung cancer: collaborative analysis of individual data from 13 European case-control studies". British Medical Journal. 330 (330:223): 223. doi:10.1136/bmj.38308.477650.63. PMC 546066Freely accessible. PMID 15613366.
  2. ↑ Kirby et al. p. 3
  3. ↑ Vanchieri, Cori (November 7, 1990). "Radiation Therapy Pursuit Leads to Unearthing of "Hot Bones"". Journal of the National Cancer Institute. 82 (21): 1667. doi:10.1093/jnci/82.21.1667. Retrieved January 31, 2015.
  4. 1 2 Keith, S; et al. (May 2012). Toxicological Profile for Radon. Atlanta (GA): Agency for Toxic Substances and Disease Registry (US).
  5. ↑
  6. ↑ Porstendörfer, J.; et al. (September 1994). "Daily variation of the radon concentration indoors and outdoors and the influence of meteorological parameters.". Health physics. 67 (3): 283–7. doi:10.1097/00004032-199409000-00011. PMID 8056597.
  7. ↑ Bartoli, G.; et al. (1989). "Evaluation of the exposure levels to radioactivity in the hot-spring environment of the Island of Ischia during a year". Annali di igiene : medicina preventiva e di comunità. 1 (6): 1781–823. PMID 2484503.
  8. ↑
  9. ↑ Yamamoto, Masayoshi; et al. (September 21, 2005). "Seasonal and spatial variation of atmospheric 210Pb and 7Be deposition: features of the Japan Sea side of Japan". Journal of Environmental Radioactivity. 86 (1): 110–131. doi:10.1016/j.jenvrad.2005.08.001. PMID 16181712. Retrieved January 31, 2015.
  10. ↑ "Basic Information about Radon in Drinking Water". United States Environmental Protection Agency. United States Environmental Protection Agency. June 30, 2014. Retrieved January 31, 2015.
  11. ↑ Yamazawa, H.; M. Matsuda; J. Moriizumi; T. Iida (2008). Wet Deposition of Radon Decay Products and its Relation with Long-Range Transported Radon. The Natural Radiation Environment. 1034. pp. 149–152. doi:10.1063/1.2991194. Retrieved 2011-08-23.
  12. ↑ Greenfield, M.B.; A. Iwata; N. Ito; M. Ishigaki; K. Kubo (2006). Intense γ radiation from radon progeny accreted in/on rain during and following thunderstorms. Bulletin of the American Physical Society. Nashville, Tennessee.
  13. ↑ Greenfield, M. B.; N. Ito; A. Iwata; K. Kubo; M. Ishigaki; K. Komura (2008). "Determination of rain age via γ rays from accreted radon progeny". Journal of Applied Physics. 104 (7): 074912. Bibcode:2008JAP...104g4912G. doi:10.1063/1.2990773. ISSN 0021-8979. Retrieved 2011-08-23.
  14. ↑
  15. ↑
  16. ↑
  17. ↑ Denman, A.R.; Eatough, J.P.; Gillmore, G.; Phillips, P.S. (December 2003). "Assessment of health risks to skin and lung of elevated radon levels in abandoned mines.". Health Physics. 85 (6): 733–9. doi:10.1097/00004032-200312000-00018. PMID 14626324.
  18. ↑ Hala, Jiri; Navratil, James (2003). Radioactivity, Ionizing Radiation, and Nuclear Energy. Konvoj. ISBN 9788073020538.
  19. ↑ "Man-made Mineral Fibres and Radon". IARC Monographs on the Evaluation of Carcinogenic Risks to Humans (43). 1988. Retrieved January 31, 2015.
  20. ↑ Samet, J. M. (January 1992). "Indoor radon and lung cancer. Estimating the risks.". Western Journal of Medicine. 156 (1): 25–9. PMC 1003141Freely accessible. PMID 1734594.
  21. ↑ "The Radon Story". The Radon Council. 2001. Retrieved January 1, 2015.
  22. 1 2 Boyd, David R. (2006). "Radon The Unfamiliar Killer". Healthy Environment, Healthy Canadians Series, Report No.1. Vancouver: David Suzuki Foundation. Retrieved February 1, 2015.
  23. ↑ Roessler, C. E.; et al. (1996). Design and Testing of Sub-Slab Depressurization for Radon Mitigation in North Florida Houses: Part I - Performance and Durability (PDF). Research Triangle Park, NC 27711: United States Environmental Protection Agency.

Further reading

This article is issued from Wikipedia - version of the 11/8/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.