Radiation Measurements

This is the amount of energy that was absorbed in a certain amount of matter

• Absorbed Dose

• Dose Equivalent

• Exposure

• Air Kerma

Absorbed Dose

This is the amount of radiation absorbed by a person, factoring in biological effects if different radiation types

• Absorbed Dose

• Dose Equivalent

• Exposure

• Air Kerma

Dose Equivalent

This is the total # of ionizations in air

• Absorbed Dose

• Dose Equivalent

• Exposure

• Air Kerma

Exposure

This is the amount of Kinetic Energy released in a medium

• Absorbed Dose

• Dose Equivalent

• Exposure

• Air Kerma

Air Kerma

Absorbed Dose measure which radiation types?

All

Absorbed Dose:

• Traditional unit

• SI Unit

• Traditional unit: Rad

• SI Unit: Gray

1 Gray = ___ rad

100

Dose equivalent factors in _______ ________

Quality Factor

Dose Equivalent

• Traditional unit

• SI Unit

• Traditional unit: Rem

• SI Unit: Seivert

1 Sv = ____ rem

100

Dose equivalent equation

Sv = Gray x QF

Exposure is only measured for which particles

• X-rays

• Gamma Rays

Exposure is defined in ____ (low/high) energies

Low

Exposure:

• Traditional unit

• SI Unit

• Traditional unit: Roentgen

• SI Unit: C/kg

1 Roentgen = _______ C/kg

2.58×10^-4

Air Kerma involves ______ (direct/indirect) ionization

Indirect

Air Kerma

• Traditional unit

• SI Unit

• Traditional unit: Kerma

• SI Unit: Gray

Does Air Kerma measure biological damage

No

This shoes how different tissue and organs respond to radiation

• Dose Equivalent

• Effective Dose

• Air Kerma

• Exposure

Effective Dose

What is used to determine Effective Dose

Weighting Factors

Effective Dose

• Traditional unit

• SI Unit

• Traditional unit: Rem

• SI Unit: Sv

ED:

Bone and Skin

0.01

ED:

Bladder, Breast, Liver, Esophagus, Thyroid

0.05

ED:

Bone Marrow, Colon, Lung, Stomach

0.12

ED:

Gonads

0.2