VAX-11/780机上CERN程序库介绍

INTRODUCTION OF CERN PROGRAM LIBRARY USED IN VAX-11/780

一、CERN 程序库概述CERN 程序库是 CERN(欧洲核物理研究中心)发展的物理计算应用软件库,其中包括基本的数值计算方法、量子力学、粒子物理及高能物理等方面的计算程序。CERN 库大约由2500个子程序组成。按照各个子程序功能可分为大约450个程序包。子程序的80%是用 FORTRAN 语言编程(FORTRAN77或 FORTRAN4),剩余的用汇编语言编程。

Precise and accurate determination of ^(241)Am/Puα activity ratio is of paraomount importance for calculating ^(241)Am in plutonium samples. A problem usually encountered in the α spectrometry is the tail contribution due to energy degradation of ^(241)Am peak (5. 486 MeV) to the low energy Pu(mainly ^(239)pu 5. 155 MeV). A lot of computer programs are available for acorrecting this contribution. The objective of this work was tp evolve a simple evaluation procedure to be used for computing the α activity ratios without resorting to complicated computer programs. The α activity ratios of pure ^(241)Am and pure Pu samples were determined by Si (Au) α spectrometer. And empirical formula of calculating the ratio was established. ^(241)Am/Pu α activity ratio in lAW high level liquid waste samples were measured using this method. At the same time, α activity of these samples were measured by ionization chamber. Finally, concentration of Pu, Am and the other nuclides in various liquid wastes were determined.