| 摘要 |
PROBLEM TO BE SOLVED: To determine quantitatively even nuclides close in their energy levels without carrying out chemical separation, and to easily and quickly determine quantitatively even anα-ray emitting nuclide of a long half-life. SOLUTION: A pulse incident into anα-ray detector is read by a computer, a time distribution of the pulses is found by a very-short-time measuring timer to be plotted, fitting is carried out by linear least square method resulting from a background and non-linear least square method resulting from a correlative event of parents and decay products, a generation probability P (t) from all the parent nuclides to the decay products thereof is found thereby, a random event portion is subtracted therefrom to extract a correlational event portion from the parent nuclides to the decay products thereof, and the portion is divided by a measuring time, a sample supplied amount and efficiency to find a radioactivity per unit. A nuclide unnecessary on the measurement is determined quantitatively by this method to be removed from an energy spectrum of a target nuclide, and a background is lowered thereby to determine the target nuclide quantitatively by a pulse-height discrimination.
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