Light tight tests: Extra oral cassette tests

Question 1

Extra oral cassettes

Answer 1

should be cared for correctly to ensure that pts are not exposed to radiation when the equipment is not functioning to its full potential

Question 2

1.

Answer 2

this includes cleaning the intensifying greens with recommended cleaning solutions

Question 3

2.

Answer 3

to avoid scratches + visually inspect inside for foreign objects such as hair + dust particles

Question 4

3.

Answer 4

to check the integrity of the hinges + catches

Question 5

Light tightness of extra oral cassettes

Answer 5

load a cassette with unexposed film + place on window sill in daylight for about 30 mins
process the film in normal manner, any areas where light has entered the cassette, will show as dark on a processed film

Question 6

Film cassette tests

Answer 6

load cassette with unexposed film + same sized piece of graph paper
expose cassette to x-rays, using very short exposure time
process film + look for pattern of graph paper on film - this should be uniform, any areas that show loss of definition indicate the screen + film are not making good contact