摘要
利用与VG354同位素质谱仪配套的HP9836计算机,编制了一套为解决在铷-锶和钐-钕定年法中常用的计算问题的程序。它包括以下内容: (1)标准溶液和稀释剂溶液计算程序; (2)同位素丰度和元素平均原子量计算程序; (3)均值和标准偏差计算程序; (4)最佳稀释度和最佳称重比计算程序; (5)最佳称重表绘制程序; (6)元素和同位素含量计算程序(其中包括五种不同类型的计算公式,可任意选择单校正、双校正和三校正方法); (7)Rb—Sr和Sm—Nd法年龄计算和等时线绘制程序,其中包括五种不同类型的计算方法可供选择。
A program system for the computative questions in the determinations of Rb-Sr and Sm-Nd methods has been compiled with HP BASIC language in HP 9836 computer coupled with VG 354 Mass Spectrometer. This program system includes the following aspects: (1) Computative program for preparation of standard and spike solutions. (2) Computative program of isotopic abundances and average atomic weights of elements. (3) Computativc program of mean and standard deviation. (4) Computative program of optimum dilution index and optimum ratio cf weight for mixing of normal and spike substanccs; plotting program of error factors for different mixed ratio. (5) Listing program of optimum weight table for mixed normal and spike substances. (6) Computative program of Rb, Sr, Sm, Nd isotopic and elemental concentrations. This program includes five kinds of different computative methods, i.c.: one single-, three double- and one triplc-corrective formulars in which mass fractionation is corrected. The triple-corrective method is the best one as the mass fractionation in all of three isotopic raties corresponding to that in normal, spike and mixed samples, respectively, is completely corrected. (7) Computative and plotting programs of isotopic datting for Rb-Sr and Sm-Nd methods. These programs can finish the following functions: and Calculate the isochron ages and the initial ratios with five different methods (simple regression, single error regression, equal weight regression, double error regression 1, and double error rcgrcssior 2). Check each datum point entered automatically and provide R, MSWD, and CHI2 values for checking isochron and analysing sources of errors. Plot isochron and patterns, size of which can be selected.
出处
《南京大学学报（自然科学版）》
CAS
CSCD
1990年第1期158-167,共10页
Journal of Nanjing University（Natural Science）
关键词
同位素
地质年龄
计算机
程序
Isotopic geological age
Computative program
Regression analysis
