Variation with Pressure of the Residual Ionization due to the Penetrating Radiation

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Abstract
Residual Ionization in Closed Vessels: Experimental Method.—In order to throw light upon the type of radiation responsible for the residual ionization in closed vessels, the author has measured the ionization in a sphere one foot in diameter for pressures ranging up to 21.5 atomospheres. Any corpuscular radiation not absorbed in the ionization sphere has a penetration at one atmosphere equal to or greater than the product of the dimension of the sphere and the number of atmospheres pressure. A special device was used to compensate for any fluctuations of the battery furnishing the high potential required for saturation. This consisted of two ionization spheres of the same electrical capacity which were connected to the opposite ends of a ten megohm resistance, the mid-point of which was earthed. Connections from the battery were made to the ends of the ten megohms. The final experiments were performed over water to eliminate any effect due to radio-active substance in the soil.

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