224
Accession Number
721
Compiler
Rafter, T.A.; Grant-Taylor, T.
Title Of Journal Book
The Evaluation of Radiocarbon Measurements and Inherent Statistical Limitation in Age Resolution
Collation
16 p. : ill., 1 fig.
Reference Bibliography
Includes bibliographical references
Language Of Text
English
Literature Type
Unpublished
Literature Level
Monographic
Meeting
Proceedings of the Eighth International Radiocarbon Dating Conference
Meeting City
Lower Hutt
Meeting Country
New Zealand
Abstract
A uniform approach, based upon the statistical behavior of random measurement errors, is suggested for assessing the relative merit of alternative methods of measuring radiocarbon and for interpreting and reporting the results of such measurements. The need for an objective, uniform approach is manifest because of the increasing concern with results which are close to the limits of precision or detection of the dating procedures. The standard deviation of the estimated net signal (sample counts) is first examined in terms of its dependence upon random errors arising in observations of background and gross sample counts. Because of the high precision characterizing such observations, it becomes vital to evaluate random errors additional to the Poisson (counting) errors. The ability to discriminate between samples of similar age, and minimum and maximum detectable ages are discussed. in terms of the statistical theory of hypothesis testing. An explicit approach results for the uniform treatment of detection, detectability and age limits. The performance characteristics of alternative measurement methods cannot simply be stated in terms of a single figure of merit, because of the rather complex dependence upon counting times, sample, background and modern standard counting rates, and non-Poisson sources of random errors. A reduced activity (sample activity/background equivalent activity) plot is offered as a means for planning experiments and for rapidly assessing the capabilities of any specific measurement procedure. As a result of the particular choice of variables for this plot, alternative procedures may be represented by points in a fixed, two-dimensional array, where simple translations of the entire array correspond to changes in counting time or sample age.
Keywords
radiocarbon;inherent statistical limitations;age; age resolution
pub_id
224
Meeting Date
19721018-19721025