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dottyc

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Joined: 17:43 Sun 04th Nov 2007

Last Activity: 15:04 Sun 30th Aug 2009

Gender: Female

Status: Signed_Up

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dottyc

mos 7 d

a measure of the time taken for radioactivity of a given sample to fall by fifty per cent. 4-4 -a-f-i-e thanks in advance dottyc

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