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History has forgotten the landlady, but George de Hevesy went on to win the Nobel prize in and the Atoms for Peace award in His was the first use of radioactive tracers — now routine in environmental science. ETRR-2 in Egypt forthcoming: Over half of the Mo has been made in two reactors: Output from each varies due to maintenance schedules. The targets are then processed to separate the Mo and also to recover I However, in medical imaging, the cost of Mo itself is small relative to hospital costs. Mo can also be made by bombarding Mo with neutrons in a reactor. This is still about two days from the end of irradiation, so someTBq must be made in the reactor to allow for cooling, processing, and decay en route to the users.
See also information paper on Research Reactors. Radioisotopes and radiation used in food and agriculture are helping to reduce these figures. As well as directly improving food production, agriculture needs to be sustainable over the longer term. Plant mutation breeding Plant mutation breeding is the process of exposing the seeds or cuttings of a given plant to radiation, such as gamma rays, to cause mutations. The irradiated material is then cultivated to generate a plantlet. Plantlets are selected and multiplied if they show desired traits.
A process of marker-assisted selection or molecular-marker assisted breeding is used to identify desirable traits based on genes. The use of radiation essentially enhances the natural process of spontaneous genetic mutation, significantly shortening the time it takes. Countries that have utilised plant mutation breeding have frequently realised great socio-economic benefits. In Bangladeshnew varieties of rice produced through mutation breeding have increased crops three-fold in the last few decades. During a period of rapid population growth, the use of nuclear techniques has enabled Bangladesh and large parts of Asia in general, to achieve food security and improved nutrition.
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Fertilisers Fertilisers are expensive and if not properly used can damage the environment. Insect Over 50 dating sites br?ndby Estimates of crop losses to insects vary, but are usually significant. One approach to reducing insect depradation in agriculture is to use genetically-modified crops, so that much less insecticide is needed. Another approach is to disable the insects. SIT involves rearing large populations of insects that are sterilised through irradiation gamma or X-raysand introducing them into natural populations. The sterile insects remain sexually competitive, but cannot produce offspring. The SIT technique is environmentally-friendly, and has proved an effective means of pest management even where mass application of pesticides had failed.
At present, SIT is applied across six continents. Since its introduction, SIT has successfully controlled the populations of a number of high profile insects, including mosquitoes, moths, screwworm, tsetse fly, and various fruit flies Mediterranean fruit fly, Mexican fruit fly, oriental fruit fly, and melon fly. The most recent high-profile application of SIT has been in the fight against the deadly Zika virus in Brazil and the broader Latin America and Caribbean region see also Insect control within the section on Medicine below. The function of many common consumer products is dependent on the use of small amounts of radioactive material.
One of the most common uses of radioisotopes today is in household smoke detectors. These contain a small amount of americium which is a decay product of plutonium originating in nuclear reactors. The Am emits alpha particles which ionise the air and allow a current between two electrodes. If smoke enters the detector it absorbs the alpha particles and interrupts the current, setting off the alarm. This problem is particularly prevalent in hot, humid countries. Food irradiation is the process of exposing foodstuffs to gamma rays to kill bacteria that can cause food-borne disease, and to increase shelf life.
In all parts of the world there is growing use of irradiation technology to preserve food. More than 60 countries worldwide have introduced regulations allowing the use of irradiation for food products. In addition to inhibiting spoilage, irradiation can delay ripening of fruits and vegetables to give them greater shelf life, and it also helps to control pests. Its ability to control pests and reduce required quarantine periods has been the principal factor behind many countries adopting food irradiation practices. Industrial racers Radioisotopes are used by manufacturers as tracers to monitor fluid flow and filtration, detect leaks, and gauge engine wear and corrosion of process equipment.
Small concentrations of short-lived isotopes can be detected whilst no residues remain in the environment. By adding small amounts of radioactive substances to materials used in various processes it is possible to study the mixing and flow rates of a wide range of materials, including liquids, powders and gases, and to locate leaks. Inspection and instrumentation Radioactive materials are used to inspect metal parts and the integrity of welds across a range of industries. For example, new oil and gas pipeline systems are checked by placing the radioactive source inside the pipe and the film outside the welds.
Gauges containing radioactive usually gamma sources are in wide use in all industries where levels of gases, liquids, and solids must be checked. They measure the amount of radiation from a source which has been absorbed in materials. These gauges are most useful where heat, pressure, or corrosive substances, such as molten glass or molten metal, make it impossible or difficult to use direct contact gauges. The ability to use radioisotopes to accurately measure thickness is widely utilised in the production of sheet materials, including metal, textiles, paper, plastics, and others. Several Bantu kingdoms—notably those of the Kongothe Loangoand the Teke —built trade links leading into the Congo River basin.
After centuries as a major hub for transatlantic trade, direct European colonization of the Congo river delta began in the late 19th century, subsequently eroding the power of the Bantu societies in the region. The French designated Brazzaville as the federal capital. Economic development during the first 50 years of colonial rule in Congo centered on natural-resource extraction. The methods were often brutal: Congo benefited from the postwar expansion of colonial administrative and infrastructure spending as a result of its central geographic location within AEF and the federal capital at Brazzaville. Following the revision of the French constitution that established the Fifth Republic inthe AEF dissolved into its constituent parts, each of which became an autonomous colony within the French Community.
During these reforms, Middle Congo became known as the Republic of the Congo in  and published its first constitution in By the time the Congo became independent in AugustOpangault, the former opponent of Youlou, agreed to serve under him. Youlou became the first President of the Republic of the Congo. Youlou ruled as the country's first president until labour elements and rival political parties instigated a three-day uprising that ousted him. Marien Ngouabi changed the country's name to the People's Republic of the Congodeclaring it to be Africa 's first Marxist—Leninist state. He was assassinated in Ngouabi, who had participated in the coup, assumed the presidency on 31 December Two years later, Yhombi-Opango was forced from power and Denis Sassou Nguesso become the new president.