Intro To Rad

Question 1

Dark room light proofing

Answer 1

• helps avoid film fogging

- the colors of the walls are very light

Question 2

The safe light

Answer 2

• can be no closer then 4 feet to the film
• the max wattage is 15
• the color of the safe light is dependent on the type of film used (we use red)

Question 3

When processing film you must…

Answer 3

be quick

• no film is safe for prolonged periods of time
• doing it quickly avoids film fogging

Question 4

T/F

If a film is exposed to unsafe light it will cause fogging and make your film dark

Answer 4

True

Question 5

Safe light testing

Film Testing

Answer 5

• Expose 1/4 of the film in 1 minute intervals
• Keep unexposed parts covered
• The part exposed first will be darkest

Question 6

T/F

Film bins can only be opened in the dark

Answer 6

True

Question 7

What are the five steps to manually process a film?

In what direction do we go?

Answer 7

1. developing
2. rinsing (allow to drip before moving into fixer)
3. fixing
4. washing
5. drying

• left to right

Question 8

What can be prepared in the light?

Answer 8

-Cassette
IF MANUAL 
- gloves and goggles 
- cassette and hangers 
- clock/timer

Question 9

What must be done in the dark?

Answer 9

• opening of cassette removal of exposed film
• reload film
• film processing

Question 10

T/F

The hotter the developer the less time is needed to develop the film

Answer 10

True

Question 11

Step 1 - Developer

Answer 11

• tap sides to dislodge air bubbles
• put lid back on ASAP
• time in developer is dependent on temp and film type

Question 12

Developer purpose

Answer 12

• converts latent image (invisible) to a visible image

- converts the exposed silver halide crystals to black metallic silver

Question 13

Step 2 - Rinse Bath

Answer 13

• Agitate for 30 seconds
• film can still be affected by unsafe light
• allow water to drip before moving on

Question 14

Step 3 - Fixer

Answer 14

• clears away unexposed silver halide crystals
• changes from milky white to clear white
• hardens the emulsion

Question 15

T/F

Fixing time is 2 times the developing time

Answer 15

True

Question 16

Why is the temperature of the developer important?

Answer 16

• if the temps are different reticulation will occur

- poor quality image

Question 17

Define

Reticulation

Answer 17

is an unsmooth film surface, which can happen when there is a large discrepancy of temperature between the fixer and the developer

Question 18

Step 4 - Wash Bath

Answer 18

• removes the processing chemicals from the film

- if not done discoloration will occur over time

Question 19

T/F

The wash time is 4 times the developing time

Answer 19

True

2 times the fixing time

Question 20

Step 5 - Drying

Answer 20

• prevent film from touching each other or paper towels until completely dry
• dryer can also be used

Question 21

T/F

Fixer chemicals can not be washed down the drain

Answer 21

True

Question 22

What are some advantages of the automatic processor?

Answer 22

• standardized and consistent quality
• fast processing
• dries quickly
• saves labour

Question 23

What are some disadvantages of the automatic processor?

Answer 23

• high purchase price
• still need darkroom
  (can be smaller
  -Dry side for film and wet side is processor

Question 24

What are some differences between automatic and manual processing?

Answer 24

• higher temp
• special chemicals
• no rinse between developer and fixer
• film transported via rollers

Question 25

Why must we label the films?

Answer 25

• later identification
• determine progressive evaluation of diseases
• legal reasons - directly on film

Question 26

What must be on a label?

Answer 26

• name, address of hospital
• date
• name of owner and patient
• group number
• log number

Question 27

How long must a vet keep an X-ray for?

Answer 27

• minimum 5 years