By Georg von Hevesy
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Extra info for A manual of radioactivity,
Aluminium to 0-23 of their initial velocity (cf. p. 31, and Table 8, been possible to measure the diminution in velocity p. 33). It has also and in energy of an a-particle by determining the heating effect of the a-rays after they have passed through a layer of gas of variable thickness. Accurate investigations have shown that for certain radio-elements the whole of the a-particles do not leave the atom with the same velocity. ) has been detected. The relative velocities and components of this fine structure can be seen from the following Table 4 (cf.
Rev. 50, 394; (1936). 2. RUTHERFORD, LORD, WYNN- WILLIAMS, C. , LEWIS, W. , BOWDEN, B. 3. 4. 5. , Proc. Roy. Soc. (A), 139, 617 (1933). WALKER, B. , Dissertation, Tubingen (1934). , Ann. d. Physik, 27, 373 (1936). , Wien. Ber. (II a), 139, 327 (1930); 140, 271(1931); 143,285,401(1934); 144,403(1935); 145,605(1936). , and DABHOLKAR, V. , Proc. Phys. Soc. 48, 285 (1936). H. (36) III THE 1. Mass and Charge of the j8-RAYS p-Rays deflexions experienced by jS-rays when they pass between the poles of a magnet or between the plates of a charged condenser show The a great similarity in direction and in magnitude to those found with cathode rays.
Seattrring of j3 -Rays aft(r passing through Aluminium Foil. Chap. Ill, 3 RANGE OF THE 0-RAYS. /3-RAY SPECTRA 41 and the density of the absorbing material is practically independent of the material. The stopping power of an atom is roughly proportional to the atomic number, but more accurate investigation reveals a periodicity of the stopping power. -rays can also be shown by cloud photographs. Thus the j8-rays from RaD comprise two strong j3-ray groups having velocities correand 39 per cent, of the velocity of light, and having energies corresponding to 3 1 ,000 and 43,000 volts respectively.