Barium in a suitable form is administered to patients before an X -ray examination of the stomach, because-

Barium in a suitable form is administered to patients before an X -ray examination of the stomach, because-
1). barium allows X ? rays to pass through the stomach on account its transparency to X ?rays
2). barium is a good absorber of ? rays and this helps the stomach to appear clerly in contrast with the other regions in the picture
3). barium is a good absosrber of X?? rays and this helps the stomach to appear clerly in contrast with the other regions in the picture
4). barium slats are white in colour and this help the stomach to appear clearly in contrast with other region in the pictures

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