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A modified lsogen (Is o tope Generation) computer program was devised that can be used: 1. To determine the change in isotopic concentration of an element; hence, to determine the specific activity over extended periods of time. 2. To determine procedures necessary to analyze for any particular element. 3. To determine if nuclides or elements are present in detectable quantities. • 4. To predict the isotopic concentration and impurity content of the final product at any given time in the future.

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