Radiobutton change not detecting checked button

With jquery 1.9.1, using the radio button change event does not detect the fact that the radio button selection has changed.

this works with 1.8.3 but not with 1.9.1

1.9.1 shows original checked button does not pick up the change

any ideas, this is a urgent problem for me.

Thanks

<!DOCTYPE html>
<html lang="en">
<head>

</head>
<body >
1.<input type="radio" name="rdio" value="a" checked="checked" />

2.<input type="radio" name="rdio" value="b" />

3.<input type="radio" name="rdio" value="c" />

</body>
</html>
<script src="http://localhost:41964/Scripts/jquery-1.9.1.js"></script>
<script>

    $(document).ready(function () {
        $("*[type=radio]").change(function () {
           alert( $(this).attr("checked"))
        })
    })

</script>

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