1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Why is radon in houses still dangerous?

  1. Apr 3, 2014 #1
    1. I've been wondering about this a lot. It's about the health risks of radon in houses, since radon has a half-life of 3.8 days, and most radon houses(at least where I live(sweden)) were built it the sixties, how come it's still such a big problem? Shouldn't the radon have decayed by now? I know the "parent" element to radon is radium and that it's half-life is 1620 years so is that the problem? The amount of radium?

    Thanks in advance
  2. jcsd
  3. Apr 3, 2014 #2
    Radon is constantly being produced in underground rocks. Being a noble gas it easily sips out of the rock and can potentially build up inside homes where it decays.
  4. Apr 3, 2014 #3


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    What Dauto said.

    In some countries the building regulations require Radon barriers to be added to floor and/or a ventilated voids below the floor. Lots of info out there..


    http://www.melton.gov.uk/PDF/Radon%20-%20Protective%20Measures%20in%20New%20Dwellings.pdf [Broken]
    Last edited by a moderator: May 6, 2017
  5. Apr 3, 2014 #4


    User Avatar

    Staff: Mentor

    Many cases of radon in houses in Sweden is actually due to the use of "blue concrete" (blåbetong), which was made using lime containing uranium. It is that uranium which is decaying and producing radon.

    A good source of information (for those who can read Swedish) is http://www.radonguiden.se/ [Broken]
    Last edited by a moderator: May 6, 2017
  6. Apr 3, 2014 #5
    Thanks for the fast replies mates!

    I found that uranium is the bad guy in this, it's the one constantly supplying radon since it's half life is millions of years!

    Again, thanks!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted