To get the value of checked radio button in sencha touch, first add a groupValue to the radio button and then get the group value through the getGroupValue() method, like this:
var centre = Ext.ComponentQuery.query('radiofield[name=Centre]');
Ext.Msg.alert('Selected Centre', centre[0].getGroupValue());
If you want to learn more about radio button, then you can read my article:
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