Abstract
The paper describes measurements of the ionisation produced in air by radium sources. Various errors such as scattering from the wall of the ionisation chamber and room, finite size of chamber and source, atomic number of walls of chamber, etc., are discussed in detail. A carefully standardised measuring system is described, and the results of measurements with carbon, magnesium, lead, and paraffin wax chambers are given. A section of the paper is devoted to questions of accurate measurement of radium sources, particularly in relation to the errors which may arise from the use of various types of ionisation chamber. It is concluded that the total charge set free per cubic centimetre of air at N.T.P., at I cm. distance from a point source of I mg. Ra element filtered with 0·5 mm. Pt, is 8·3 electrostatic units per hour.
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