Need to Know (4)

Question 1

Weighting Factor/RBE/Q for different radiation types

Answer 1

• X-rays = 1
• Gamma Rays= 1
• Beta Particles = 1
• Neutrons (energy greater than 10KeV) = 10
• Alpha Particles = 20

Question 2

Characteristic intensity at 1 Metre

Answer 2

• Iridium-192 = 0.486 R/h or 0.12 mSv/h
• Cobalt-60 = 1.35 R/h or 0.36 mSv/h
• Selenium-75 = 0.18 R/h or 0.048m Sv/h
• R/h = 1 Ci
• mSv/h = 1 GBq