Open AccessThe ionisation produced by an α-particle. Part II.—Connection between ionisation and absorption
Publication year - 1910
Publication title -
proceedings of the royal society of london. series a, containing papers of a mathematical and physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9150
pISSN - 0950-1207
DOI - 10.1098/rspa.1910.0039
Subject(s) - ionization , radium , particle (ecology) , ionizing radiation , atomic physics , range (aeronautics) , absorption (acoustics) , pencil (optics) , materials science , chemistry , optics , irradiation , physics , nuclear physics , ion , oceanography , composite material , geology , organic chemistry
In the course of some experiments described in a previous paper, the ionisation produced by anα -particle along its path in air (Bragg curve) was determined with Radium C as source, and under conditions which were most favourable for saturation. The general shape of this curve is well known. The ionisation due to a parallel pencil ofα -particles from Radium C (range in air, 7·06 cm.) increases up to a maximum value at 6·5 cm. During the next 5 mm. of its path the ionisation decreases rapidly to zero. The following experiments were undertaken to throw light on the law of absorption of theα -particle, and to establish, if possible, a connection between its velocity and ionising power.