The concern then is that they emit alpha radiation which can be damaging, carcinogenic, to the delicate lung tissue. Alpha radiation cannot penetrate a watch case but radon gas escaping from the watch case, or paint dust or flakes, can be breathed in and enter the lungs. The wrist is relatively insensitive to radiation, but do not spend too long closely examining the dials of radioluminescent watches. Gamma radiation will pass through a wristwatch case and irradiate the wrist, or the eye during examination of a watch. Radon itself decays by splitting into lighter atoms which are also radioactive, emitting more radiation in the process. Radium atoms decay by fission (splitting) into Radon, which is a gas at room temperature, and alpha and gamma particles which are emitted as radiation.
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