Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    2
    ReputationRep:
    http://qualifications.pearson.com/co...e_20130620.pdf
    For question 18b of the paper above, is it right to say that the second point of the mark scheme below relates to the ionisation of skin molecules
    http://qualifications.pearson.com/co...c_20130815.pdf
    Offline

    1
    ReputationRep:
    no
    Offline

    20
    ReputationRep:
    No... it's dangerous when the alpha emitter is inside your body ionising living cells... the skin on the outside of your body is much tougher and has a layer of dead cells at the surface.

    The great worry with particles of polonium is getting small pieces of it on your fingers - not because it'll really do a lot of damage to the skin on your fingers (because of the layer of tough dead skin cells on the outside of your body) but because you'll eventually transfer it to your mouth and swallow some - when it's inside your body it's much more dangerous because the interior surfaces of your body are made of living cells.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by Joinedup)
    No... it's dangerous when the alpha emitter is inside your body ionising living cells... the skin on the outside of your body is much tougher and has a layer of dead cells at the surface.

    The great worry with particles of polonium is getting small pieces of it on your fingers - not because it'll really do a lot of damage to the skin on your fingers (because of the layer of tough dead skin cells on the outside of your body) but because you'll eventually transfer it to your mouth and swallow some - when it's inside your body it's much more dangerous because the interior surfaces of your body are made of living cells.
    thanks
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Brussels sprouts
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.