When taking radiographs on a 10 year old child, which of the following should be used to decrease radiation exposure?
1. A lead apron.
2. A decrease of the kilovoltage to 50kVp.
3. Use of high speed film.
4. Application of a radiation protection badge.
(2) and (4)
(1) and (3)
(1) (2) (3)
All of the above
(4) only
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