Ways of Controlling Exposure (7)

Question 1

Three basic ways of controlling exposure to harmful radiation

Answer 1

• Time
• Distance
• Shielding

Question 2

Controlling Exposure - Time

Answer 2

Less time you spend near a radiation source the less radiation you are exposed to.

Question 3

Controlling Exposure - Distance

Answer 3

The farther you stand from the radiation source, the less radiation you are exposed to.

Question 4

Controlling Exposure - Shielding

Answer 4

Any shielding between you and the source of radiation, reduces your exposure.

Question 5

What is a Collimator?

Answer 5

Made of tungsten or lead used to partially surround the source to absorb radiation not being directed to an object being radiographed.
- Most practical use of shielding for radiography

Question 6

Define Half-Value-Layer

Answer 6

thickness of a shielding material required to reduce the original radiation intensity to 1/2 the original

Question 7

Define Tenth-Value-Layer

Answer 7

Thickness of a shielding material required to reduce the original radiation intensity to 1/10 the original

Question 8

Shielding Materials

Answer 8

• Depleted Uranium
• Concrete blocks
• Lead sheets