The amount of radiation to a patient can be reduced by
1. using a high speed film.
2. using an aluminum filter.
3. using low kVp.
4. increasing target-film distance.
5. decreasing target-film distance.

(1) (2) (3) (4)

(1) (2) (4)

(1) (3) (5)

(2) (3) (4)

(2) (3) (5)