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cesium-137 (137Cs)

a radioactive material with a half-life of 30.2 years that is used in radiotherapy as a sealed source of gamma rays intended for application to various malignancies that are treated by brachytherapy. Cesium has replaced radium for such applications. See also brachytherapy.


a chemical element, atomic number 55, atomic weight 132.905, symbol Cs. See Table 6.

a product of atomic fission by explosion or breakdown of a reactor. It is feared as a pollutant because of its very long half-life.
References in periodicals archive ?
Migration of 137Cs in tributaries, lake water and sediment of Lago Maggiore (Italy, Switzerland)-analysis and comparison with Lago di Lugano and other lakes, Journal of Environmental Radioactivity 100(1): 35-48.
Distribution and flux of 238Pu, 239,240Pu, 241Am, 137Cs and 210Pb to high arctic lakes in the Thule district (Greenland), Journal of Environmental Radioactivity 75(3): 285-299.
Determination of 137Cs in the water system of a pre-Alpine lake, Journal of Environmental Radioactivity 100(4): 354-360.
Artificial radionuclides such as 239,240Pu have also been extensively used to establish dating horizons in sediments while 137Cs has been applied to examining vertical advection and mixing rates in surface and intermediate waters of the ocean basins.
These studies have included measurements of the transport of 137Cs from the Sellafield reprocessing plant into the Arctic Ocean through Fram Strait and the vertical cycling of 210Pb, 210Po and 226Ra in the Central Arctic Ocean.
2 spectrometric measurements collected soil samples (264 samples), the method of semiconductor gamma-ray spectrometry approved by the President of the NAEA, in order to determine the concentrations of the test samples 137Cs and natural radionuclides (226Ra, 228Aci 40K).
Studies on 137Cs transfer in soil-fern system, Journal of Environmental Engineering and Landscape Management 13(3): 97-102.
Modelling vertical migration of 137Cs in Lithuanian soils, Journal of Environmental Engineering and Landscape Management 16(1): 2329.
A Hamamatsu R6427 photomultiplier tube (PMT) was used for recording pulse height spectra with 662 keV gamma rays from a 137Cs source.
The thesis details research involving sodium nonatitanate, a more efficient ion exchanger, to separate the highly radioactive isotopes (90Sr, 137Cs, and transuranics) from the large quantities of inert salts.
Figure 2 shows the information obtained by clicking on the 137Cs block in Figure 1.