Exposure to these forms of radiation is only prevented by using a heavy metal shield. As with alpha and beta particle producers, contact with the material must be avoided. Injury caused by radiation may not develop for many days or even years after exposure. Radioactivity is not destroyed by fire. In fact fire, explosion, and water dispersion as part of a fire may make a radioactive material incident worse by spreading radiation-emitting material over a large area.
Cryogenic gases are gases shipped and stored refrigerated and under pressure.
Tank shape and a visible vapor cloud upon release should alert the First Responder to the presence of a cryogenic gas. All of these gases are released from storage vessels at temperatures so low that they will instantly freeze unprotected tissues like skin and eyes. The release of even small amounts of gas can produce large amounts of vapor. Leaking cryogenic containers should not be approached. Trained personnel and appropriate equipment are required to stop the leak.