Post on 01-Oct-2015
*
* ; ( ) .
* ; .
* ; . , .
*, . "", . ... 92p 146n.
* ; , . . , , .
* .
*
* , .
*m Rn+ma =222,017574u+4,002603u=226,020177umRa= 226,025406um= 0,005229u (E=mc2) E=4,87MeV
*
* ( )
( )
* . , , .
* +e+ e . , , .
*
*, . , .
* . . () () .
*4,871MeV4,685MeV0,186MeV
* , ,
* , ,
*
* ., t = -..t . .
*- . SI 1 Becquerel (Bq).1Bq = 1 /s
* (1/2) , 0 . -
* .
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