Week 4 - Biological effects of radiation

Question 1

The basic principle for all ionizing radiation requests is:

Answer 1

Justification

Question 1

Code of conduct for registered health practioners

Answer 1

Consider the balance of benefit and harm in all clinical management decisions

Question 2

Severity of effect from radiation depends directly on:

Answer 2

• Dose and dose rate
• Region of body exposed
• age and health of individual

Question 3

Dose quantities

Answer 3

• Absorbed does - energy deposited in a kg of a substance by the radiation
• equivalent dose - absorbed dose weighted for harmful effects of different radiations
• effective dose - equivalent dose weighted for susceptibility to harm of different tissues

Question 4

Dose limits

Answer 4

occupational exposure = 50mSv
Public expsire = 1mSv

Question 5

Tissue categories

Answer 5

Radio sensitive
Radio-resistant

Question 6

Radiosensitive

Answer 6

stem cells
younger tissues and organs
high metabolic activity
high growth rate

Question 7

Radio-resistant

Answer 7

mature cells
older tissues and organs
low metabolic activity
low growth rate

Question 8

If DNA is damaged from radiation, what can occur:

Answer 8

• the damage will be repaired prior to the end of the cell’s growth cycle
  -the cell will die prior to division
• the cell repairs itself imperfectly and replicates this imperfect structure

Question 9

Are diagnostic xrays partial body or whole-body exposure

Answer 9

partial-body