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    How long does radiation stay in an area? Does it last like a month or so then leave?

    Question #114815. Asked by DMKTENN. (May 22 10 6:01 PM)


    serpa

    		It depends on the type of radiation. Different half-lives are involved with different types of ionizing radiation.

    Uranium- 235 has a half life of 700 million years
    Polonium-210 has a half-life of 138 days
    Polonium-208 has a half-life of almost 3 years


    "Half-life. The time required for half the nuclei in a sample of a specific isotopic species to undergo radioactive decay."
    http://www.thefreedictionary.com/half-life

    May 22 10, 6:55 PM
    looney_tunes

    		Half-life tells you the time it takes for half of the radiation due to decay from a particular source to disappear. How long there continues to be a dangerous level of radiation in an area would therefore also depend on the original quantity. The level would halve as each half-life passes, but still could be quite high if there were a lot to start with.

    http://en.wikipedia.org/wiki/Radioactive_contamination

    May 22 10, 10:35 PM

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