Gamma radiation is an electromagnetic wave, it's even shorter than the wavelength of X-rays, high energy, with a strong penetrating ability. It will destroy the cellular and molecular structure of organisms, cause harm to humans.
1: Tungsten nickel alloy to gamma-ray absorption coefficient of 137 Cs0.661MeV is 0.0987cm-1,and semi-absorption thickness is 0.376cm.
2: Tungsten nickel alloy to gamma ray absorption coefficient of 60Co 1.33MeV is 0.0470cm-1. Semi-absorption thickness is 0.827659574cm.
3: Tungsten nickel alloy to absorption coefficient of 226Ra is 0.1843cm-1. Semi-absorption thickness is 3.203472599cm.
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