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dc.contributor.authorBell, Louis Alberteng
dc.date.issued1914eng
dc.date.submitted1914eng
dc.descriptionTypescript.eng
dc.descriptionIncludes bibliographical references.eng
dc.description.abstractThe quantitative determination of the small amounts of radium present in the atmosphere, spring waters, minerals and rocks involves two steps: (1) The quantitative separation of the radium emanation in a known weight of the sample and (2) measurement of the ionization current produced by the emanation in a calibrated electroscope. Granting that we have accurate methods of separating radium emanation, the other problem of measuring the ionization of current and the calibration of the electroscopes for quantitative work must be given careful study, because the results ultimately depend upon the calibration constants of the electroscopes used. In the estimation of radium, the electroscope corresponds to the weights and analytical balance in ordinary quantitative chemical analysis. An electroscope is said to be standardized or calibrated when we know the quantity of radium, (or uranium) represented by some constant of the instrument. The present investigation includes the calibration of three types of alpha ray electroscopes extensively used for the determination of small quantities of radium by the emanation method. The known quantities of the radium emanation required in these experiments were obtained, (1) from uraninite (Pitchblende) of known uranium content, and (2) from a standard radium solution. In this connection a comparative study was made of the types of apparatus employed by several investigators for the separation of the emanation and its transfer to the electroscopes, with a view of standardizing the existing methods for the calibration of electroscopes.eng
dc.description.digitizationDigitized at the University of Missouri--Columbia MU Libraries Digitization Lab in 2012.eng
dc.format.extent75 leaves : illustratedeng
dc.identifier.merlinb23400924eng
dc.identifier.oclc24607988eng
dc.identifier.urihttps://hdl.handle.net/10355/16138
dc.identifier.urihttps://doi.org/10.32469/10355/16138eng
dc.languageEnglisheng
dc.publisherUniversity of Missourieng
dc.relation.ispartofTheses and Dissertations (MU)eng
dc.relation.ispartofcollectionUniversity of Missouri--Columbia. Graduate School. Theses and Dissertationseng
dc.rightsOpenAccess.eng
dc.rights.licenseThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License.eng
dc.subject.lcshRadium -- Measurementeng
dc.subject.lcshRadon -- Measurementeng
dc.subject.lcshElectroscope -- Calibrationeng
dc.titleA comparison of some methods of estimating radiumeng
dc.typeThesiseng
thesis.degree.disciplineChemistry (MU)eng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelMasterseng
thesis.degree.nameM.A.eng


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