| 摘要 |
PURPOSE:To obtain a true value of intensity without complexity by obtaining self- correlation fuctions by gamma rays from respective nuclides, and independently drawing out the gamma rays intensity from a nuclide having a short half-life period. CONSTITUTION:If the half-life period of nuclide having a short half-life period which is an object to be measured is expressed by T, the gamma ray intensity at time (t) is expressed by Aexp(-t/T) (where A is a constant). In addition, the gamma rays levels not to be measured are regarded as to be constant because the half-life periods thereof are long, and the self-correlation function R(tau) is approximated by R(tau)= B<2>. Accordingly, if B, which has been known by R(tau), is subtracted from the initially obtained gamma ray level, Aexp(-t/T)+B, the gamma ray level of the nuclides to be measured is made known. For example, the gamma ray count levels at times 0-2tau are stored in 2n memories 1, the change of said level with time is obtained, and the integrated value is obtained in a multiplier 2 and an adder 3 and divided by time (t) in a divider 4 to obtain B<2>. Then, B is obtained in a square-root calculator 5 and subtracted from the initial level value in a subtracter 7 to obtain a desired value. |
