Radiation
Quantities and Units
Learning
Objectives
References
and Resources
Mind
Map Summary
Learning
Objectives
- Name the conventional and the SI
units for each of the following quantities.
exposure
absorbed dose
activity
integral dose
dose equivalent
effective dose
- Explain the relationship between exposure
and distance to the source of radiation.
- Discuss the general concept of the radiation quantity, exposure,
and its relationship to photon concentration and intensity.
- Explain the relationship between exposure and air
ionization.
- Express an exposure of 5 Roentgens in appropriate SI
units.
- Compare and explain differences in the amount of radiation delivered
to a patient when the exposure in one case is 5 Roentgens to a 100 cm2
area and in the other case, 1 Roentgen to a 500 cm2 area.
- Discuss the concept and significance of surface
integral exposure (Exposure-Area Product).
- Describe the relationship between absorbed
dose and exposure in soft tissue and
bone.
- Express an absorbed dose of 3 rads
in appropriate SI units.
- Discuss the concept and significance of integral
dose.
- Discuss the concept and significance of dose
equivalent.
- Express a dose equivalent of 100
millirems in appropriate SI units.
- Explain
the concept of effective dose and
generally how it is determined.
- Explain
the significance of tissue weighting factors.
References
and Resources
1. Chapter
3. The
Physical Principles of Medical Imaging, 2ndEd. Perry
Sprawls. Medical Physics
Publishing.
Resources on
the Web
Mind
Maps
