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Liquid-scintillation-spectrometer data processing by desk-top computer.

M A Williams, G H Cope, J L Jackson

    The Biochemical Journal
    |July 1, 1970
    PubMed
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    This study presents a computer program for accurately calculating radioactive disintegrations per minute (d.p.m.) from quench curves. The system efficiently handles single or dual isotopes, sample properties, and experimental variations for precise radioactivity measurement.

    Area of Science:

    • Radiochemistry
    • Nuclear Instrumentation
    • Computational Science

    Background:

    • Accurate quantification of radioactivity is crucial in various scientific fields.
    • Traditional methods for calculating disintegrations per minute (d.p.m.) can be complex and time-consuming.
    • The development of automated systems is essential for improving efficiency and reducing errors in radioactivity measurements.

    Purpose of the Study:

    • To develop and validate a desk-top computing system for precise calculation of radioactive disintegrations per minute (d.p.m.).
    • To enable accurate analysis of samples containing one or two radioactive isotopes, accounting for background radiation and isotope separation.
    • To integrate sample properties (weight, volume, density) and experimental parameters into radioactivity calculations.

    Main Methods:

    Related Experiment Videos

    • Programming a desk-top computer to store and process quench curves.
    • Implementing algorithms for background count subtraction and separation of counts from binary-labelled radioactive isotopes.
    • Utilizing quadratic equations to model quench curves and derive counting efficiencies.
    • Comparing efficiency calculations derived from three-point curve fitting and the method of least squares.

    Main Results:

    • The programmed system accurately stores quench curves for d.p.m. calculation.
    • The system successfully subtracts background counts and separates counts for binary-labelled samples.
    • Calculations of d.p.m. are related to sample weight, volume, and density.
    • The system demonstrates flexibility in accommodating changes in radioactive isotopes, quenching agents, scintillators, and window settings without reprogramming.

    Conclusions:

    • The developed computing system provides an accurate and efficient method for determining d.p.m. values.
    • The program facilitates the analysis of complex radioactive samples and integrates essential sample and experimental parameters.
    • The use of quadratic equations for quench curves offers a robust approach, with comparable results to least squares and graphical methods for efficiency determination.