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.
.
(1       )
CPM =        /       ( )


                           .
         CPM =
30                    CPM
                        .
γ     :

β     :                            .


    :Sv/h                     (Cs137
    ) γ                   β
         Sv/h
                               .
                (   ) β
CPM
.
        .
    (
)
20CPM   30
(   10)
?
    ?
20CPM




    10   (   )   ( )   ( )
20CPM    30




    10        (   )   ( )   ( )
80CPM




    10   (   )   ( )   ( )
80CPM    30




    10        (   )   ( )   ( )
200CPM




    10   (   )   ( )   ( )
200CPM   30




    10    (   )   ( )   ( )
CPM   µSv
      0.1µSv = 20CPM
20CPM
Background


                 (   0.1µSv/h
             )

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