Lorentz force due to magnetic field (B) acting on charged particles: alpha - positively charged and more massive, beta - negatively charged and lighted, gamma - electromagnetic radiation (trajectory not affected by the magnetic field).
The radioactive sample (red blob) in placed in a shielding container (cup made of lead). The drawing shows a cross-section view.
The drawing is based on: Charles H. Holbrow, James N. Lloyd, Joseph C. Amato, Enrique Galvez, M. Elizabeth Parks, Modern Introductory Physics, 2nd ed., Springer, New York, ISBN 9780387790794
radioactive_lorentz_force_magnetica.png
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S. Zurek, Encyclopedia Magnetica, CC-BY-4.0
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