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A Balance Method for Comparison of Quantities of Radium and Some of its Applications

Authors: Rutherford, E.; Chadwick, J.;

A Balance Method for Comparison of Quantities of Radium and Some of its Applications

Abstract

A balance method is described for accurately comparing quantities of radium by their γ-radiation, in which the ionisation due to the γ-rays is balanced against the constant ionisation due to uranium oxide. By observing the distance of the radium preparation from the ionisation chamber when a balance is obtained, the relative γ-ray activities of the two preparations can be determined with an accuracy of at least one part in 400. A method of calibration is given, and the corrections necessary to deduce the quantities of radium present are considered. Calculations are given showing the correction required to determine a quantity of emanation by comparison of its γ-ray activity with that due to a radium standard. The balance method was employed to determine the period of transformation of the radium emanation. The half value period was found to be 3.854 days. It was found experimentally that the γ-ray activity due to the radium emanation and its products reaches a maximum 255 minutes after the introduction of the emanation into a sealed tube. Calculations showed that under the experimental conditions the theoretical maximum should be reached after 255 minutes. It was found that the γ-ray activity of a radium preparation was not appreciably altered by exposure in a strong magnetic field.

Subjects by Vocabulary

Microsoft Academic Graph classification: Radium chemistry.chemical_compound Period (periodic table) chemistry Ionization Radiochemistry Calibration chemistry.chemical_element Uranium oxide

Keywords

General Engineering, General Earth and Planetary Sciences, General Environmental Science

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    8
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Top 10%
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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download
citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
views
OpenAIRE UsageCountsViews provided by UsageCounts
downloads
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8
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Top 10%
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709
244
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