Cs-137 decay scheme and data

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Special Commands

These commands are accessed by small buttons that appear on the Main form when the selected nuclide is "special". By special in this context we mean that the nuclide is either a product of the slow neutron fission of Uranium-235 or is one of 27 radionuclides in the database for which information on its decay scheme is provided.

Fission Product Yield Command

Some special nuclides are those that are products of slow neutron fission of Uranium-235 (although, since there are about 650 such nuclides, or 20% of the nuclei known to exist, they're not extremely special). As shown on page three of the Legend, these nuclides are designated by a small black dot in lower right corner. When such a nuclide is selected, a button labeled "Y"appears; clicking on this button with the mouse will pop up a window with the yield information for the nuclide (if the data are in the database). Cs-137 is a good example:

Main form with Cs-137 data

Decay Scheme Command

There are 27 special nuclides for which additional, schematic data is provided on their decay. As it happens, Cs-137 is one of the nuclides that are doubly special - that are fission products and have additional decay scheme information. If a nuclide with this additional decay information is selected on the main form, a small command button marked with a "D" appears on the left below the nuclide data window. Clicking on this button with the mouse will pop open a window with a graphic showing the principal modes of decay and the fraction of the decays that proceed by each mode.

Click on the D (above) to see the decay scheme information

In addition to Cs-137, decay scheme data is available for Na-22, Na-24, K-40, K-42, Cr-51, Co-57, Co-58, Co-60, Zn-65, Ga-67, Ga-68,Se-75, Kr-85, Rb-86, Sr-85, Mo-99, Tc-99m, In-111, I-131, Xe-133, Eu-154, Au-198, Hg-197, Hg-203. Some of these nuclides are used as detector calibration sources, others have medical applications.

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This command is not available in the Basic version
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