stokastisk skade.

Eksempel: Skøn over ækvivalent dosis fra en
ekstern kilde af 60 Co
Point source at 50 cm’s distance
Activity: 3.7 GBq
Shielding: 12 cm lead, transmission factor T = 0.001
Assuming 100 working hours under the conditions specified above, the
body surface facing the source will receive an (annual) equivalent dose of
h = 0.5 mSv a-1 This value may (as a first approximation) be taken as an upper limit to
the annual effective dose, E, to the person from the practice described
HVT (d 1/2) for γ-radiation from 60 Co in muscle tissue:
µ
−2
= 6.27× 10 cm
ρ
ρ = 1.05
2 g-1 g cm-3 ln 2 0.694
= = = 10.5 cm
µ ρ 6.27× 10
1/2 −2
The maximum allowed effective dose for radiation workers is 20 mSv a -1
2011 Isotopteknik F11 (JG) 51
d