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Radioecology is the branch of ecology concerning the presence of radioactivity in Earth’s ecosystems. Investigations in radioecology include field sampling, experimental field and laboratory procedures, and the development of environmentally predictive simulation models in an attempt to understand the migration methods of radioactive material throughout the environment.
The practice consists of techniques from the general sciences of physics, chemistry, mathematics, biology, and ecology, coupled with applications in radiation protection. Radioecological studies provide the necessary data for dose estimation and risk assessment regarding radioactive pollution and its effects on human and environmental health.
Radioecologists detect and evaluate the effects of ionizing radiation and on ecosystems, and then assess their risks and dangers. Interest and studies in the area of radioecology significantly increased in order to ascertain and manage the risks involved as a result of the Chernobyl disaster. Radioecology arose in line with increasing nuclear activities, particularly following the Second World War in response to nuclear atomic weapons testing and the use of nuclear reactors to produce electricity.
Collection of radioecological data from the Chernobyl disaster was performed on a private basis. Independent researchers collected data regarding the various dosage levels and geographical differences among the afflicted areas, allowing them to draw conclusions about the nature and intensity of the damage caused to ecosystems by the disaster.
These local studies were the best available resources in containing the effects of Chernobyl, yet the researchers themselves recommended a more cohesive effort between the neighboring countries to better anticipate and control future radioecological issues, especially considering the ongoing terrorism threats of the time and the potential use of a "dirty bomb."MØLLER Anders et MOUSSEAU Timothy A. (2006), Biological consequences of Chernobyl : 20 years on ; Revue : Trends in ecology & evolution, vol. 21, n°4, pp. 200–207 ; 8 pp et 70 ref. ; ISSN 0169-5347 (abstract) Japan faced similar issues when the Fukushima Daiichi nuclear disaster occurred, as its government also experienced difficulty organizing collective research efforts.
An international radioecology conference was held for the first time in 2007 in Bergen, Norway. 1st International Conference on Radioecology and Environmental Radioactivity 15–20 June 2008, Bergen, Norway ; Journal of Environmental Radioactivity, Volume 97, Issue 1, September 2007, pp. 83–84 European scientists from various countries had been pushing for joint efforts to combat radioactivity in the environment for three decades, but governments were hesitant to attempt this feat because of the secrecy involved in nuclear research, as technological and military developments remained competitive.Commission of the european communities international symposium on radioecology applied to the protection of man and his environment : Rome, 7–10 September 1971 Conference Hall of FAO, Viale delle Terme di Caracalla Water Research, Volume 5, Issue 6, June 1971, pp. 367–368
Occasionally, the origin of radionuclides in the environment is actually nature itself, as some geological sites are rich in radioactive uranium or produce radon emissions. The largest source, however, is artificial pollution via nuclear meltdowns or expulsion of radioactive waste from industrial plants. The ecosystems at risk may also be fully or partially natural. An example of a fully natural ecosystem might be a meadow or old-growth forest affected by fallout from a nuclear accident such as Chernobyl or Fukushima, while a semi-natural ecosystem might be a secondary forest, farm, reservoir, or fishery that is at risk of infection from some source of radionuclides.R.W. Mayes (1989), The quantification of dietary intake, digestion and metabolism in farm livestock and its relevance to the study of radionuclide uptake ; in Transfer of Radionuclides to Livestock (Oxford, 5–8 September 1988) ; Science of the Total Environment ; Vol 85, September 1989 ; ( abstract)
Basic herbaceous or bivalve species such as mosses, lichens, clams, and mussels are often the first organisms affected by fallout in an ecosystem,D. Jackson, A.D. Smith (1989) Uptake and retention of strontium, iodine and caesium in lowland pasture following continuous or short-term deposition ; pp. 63–72, in Transfer of Radionuclides to Livestock (Oxford, 5–8 September 1988) ; Science of the Total Environment ; Vol 85, September 1989 ( abstract) as they are in closest proximity to the abiotic sources of radionuclides (atmospheric, geological, or aquatic transfer). These organisms often possess the highest measurable concentrations of radionuclides, making them ideal bioindicators for sampling radioactivity in ecosystems. In the absence of sufficient data, radioecologists must often rely on analogs of a radionuclide to attempt to evaluate or hypothesize about certain ecotoxicological or metabolic effects of rarer radionuclides.
In general, techniques in radioecology focus on the study of environmental bioelectromagnetism, bioelectrochemistry, electromagnetic pollution, and isotope analysis.
Radioactivity originating from the Northern HemisphereBennett, A. Bouville, Radiation doses in countries of the northern hemisphere from the chernobyl nuclear reactor accident ; Environment International, Volume 14, Issue 2, 1988, pp. 75–82 B.G. is observable dating back to the mid-20th century. Some highly toxic radionuclides have particularly long radioactive half-lives (up to as many as millions of years in some cases), meaning they will virtually never disappear on their own. The impact of these radionuclides on biological material (correlated with their radioactivity and toxicity) is similar to that of other environmental toxins, making them difficult to trace within plants and animals.
Some aging nuclear facilities were not originally intended to operate as long as they have, and the consequences of their waste procedures were not well understood when they were built. One example of this is how the radionuclide tritium is sometimes released into the surrounding environment as a result of nuclear reprocessing, as this was not a foreseen complication in the original waste management orders of operations. It is difficult to diverge from these procedures once a reactor has already been put to use, since any change either risks releasing even more radioactive material or jeopardizes the safety of the individuals working on the disposal. Protection of human well-being has been, and remains to this day, paramount in the aims of radioecological research and risk assessment.
Radioecology often calls into question the ethics of protecting human health versus the preservation of the environment in the interest of fighting extinction of other species,R.J. Pentreath, Radioecology, radiobiology, and radiological protection: frameworks and fractures ; Journal of Environmental Radioactivity, Volume 100, Issue 12, December 2009, pp. 1019–1026 but public opinion on this matter is shifting.Antoine Debauche, Continuous radioactivity monitoring systems. From the pre-history of radioprotection to the future of radioecology ; Journal of Environmental Radioactivity, Volume 72, Issues 1–2, 2004, pp. 103–108
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