Is it normal I Think That The End of Days is Soon to Come?

You are viewing a single comment's thread.

↑ View this comment's parent

← View full post
Comments ( 5 ) Sort: best | oldest
  • thegypsysailor
    9 years ago | pl

    For the half-life of U-235? That's 703.8 million years!

    Comment Hidden ( show )
    Report
    0
    0
      -
    • Couman
      9 years ago | pl

      Which means it's not very radioactive. It's the short half-life stuff that you need worry about.

      Comment Hidden ( show )
      Report
      0
      0
        -
      • green_boogers
        9 years ago | pl

        Nope. Do the math, bud.

        Comment Hidden ( show )
        Report
        0
        0
          -
        • Couman
          9 years ago | pl

          No need, it's been done.
          http://en.wikipedia.org/wiki/Radioactive_decay
          Following a equation that I unfortunately can't paste here, it concludes "This relationship between the half-life and the decay constant shows that highly radioactive substances are quickly spent, while those that radiate weakly endure longer."

          They've also got a nice picture of somebody holding a chunk of uranium-235 with just rubber gloves.

          Comment Hidden ( show )
          Report
          0
          0
            -
          • green_boogers
            9 years ago | pl

            Well yes, if you are stuck in a meltdown, iodine-131 (half life 8 days) if a terrible threat. But since,
            N(t) = N_0 2^{-t/t_{1/2}}, strontium-90 (half life 29 years) will nail you with long range exposure.

            Comment Hidden ( show )
            Report
            0
            0