Specify the -variable option on each one. Here is an example pulled from the icon.pl demo script:
$letters = '';
my $w_frame_left_b3 = $w_frame_left->Radiobutton(
-bitmap => "\@$tk_library/demos/images/letters",
-variable => \$letters,
-value => 'full',
);
my $w_frame_left_b4 = $w_frame_left->Radiobutton(
-bitmap => "\@$tk_library/demos/images/noletters",
-variable => \$letters,
-value => 'empty',
);
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