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Safety_Series_025_1968 - gnssn - International Atomic Energy ...

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This publication is no longer validPlease see http://www.ns-iaea.org/standards/TABLE I.CHARACTERISTICS OF VARIOUS RADIATIONSType Nature Source <strong>Energy</strong> PenetrationAlpha helium nuclei radioactivenuclides (zl0Po)cyclotrona few M eV up to hundredso f M eV25 pm (4 M eV) in waterBeta electrons radioactivenuclides (210RaE)betatrona few keV to several M eVup to 100 MeV1 .5 cm (Em ax 3 M eV ) inwaterProtons hydrogen nu clei cyclotron 5 - 400 M eV 8 - 23 X 104 cm in air(proton beams)

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