North Korea escalated tensions dramatically Friday by vowing to expel U . N . inspectors monitoring its mothballed nuclear complex at Yongbyon, north of Pyongyang, and to restart a radiochemical laboratory there that could be used to extract weapons-grade plutonium.
42.
In 1938 Otto Hahn and Fritz Strassmann discovered nuclear fission with radiochemical methods, and in 1939 Lise Meitner and Otto Robert Frisch wrote the first theoretical interpretation of the fission process, which was later improved by Niels Bohr and John A . Wheeler.
43.
Such radiochemical neutrino detectors are sensitive only to electron neutrinos, and not to the second and third generation flavours of neutrinos-the neutrino oscillation of electron neutrinos emitted from the sun, between the earth and the sun, accounts for the discrepancy.
44.
Nuclear tests, including underground tests that vent into the atmosphere, produce fallout that not only indicates that a nuclear event has taken place, but, through radiochemical analysis of radionuclides in the fallout, characterize the technology and source of the device.
45.
On Friday, North Korean ratcheted up tensions by vowing to expel U . N . inspectors monitoring its main nuclear complex at Yongbyon, north of Pyongyang, and to restart a radiochemical laboratory there that could be used to extract weapons-grade plutonium.
46.
Specific examples of these applications include : analyzing ceramides and fatty acids, detection of pesticides or insecticides in food and water, analyzing the dye composition of fibers in forensics, assaying the radiochemical purity of radiopharmaceuticals, or identification of medicinal plants and their constituents
47.
"The low level of accidents over the past few years has created an illusion that radiochemical production is completely reliable, " the newspaper added, warning that the danger had actually skyrocketed in Russia with the dismantling of large parts of its arsenal.
48.
By 1978 the reactor provided technetium-99m in large enough quantities that were processed by AECL's radiochemical division, which was privatized in 1988 as Nordion, now power co-efficient of reactivity, led to the cancellation of the project in 2008.
49.
The concrete shielding was penetrated by a number of holes enabling neutron beams to be obtained for the purpose of irradiating samples and several pipes that enabled samples in sample carriers to be inserted into the reactor and subsequently removed to the adjoining radiochemical laboratory for study.
50.
Essentially, if a nuclear material has been put through a refinement process to remove the daughter species, the time elapsed since purification can be " back-calculated " using radiochemical separation techniques in conjunction with analytical measurement of the existing parent-daughter ratios.
