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IMPACT ON RADIOLOGICAL BARRIERS AND CONTROLS AT FACILITIES
Radiological barriers and controls

METHOD TO CALCULATE THE RADIOLOGICAL EQUIVALENCE

 

Now let's look at the method

begin

Find the relevant criterion, i.e. liquid, solid, airborne

next

Find the multiplication factor,
Table 4, page 35

To rate this event, we need to multiply the amount released by the multiplication factor

next

We now need to determine the level:

Compare the result with the definitions we saw two pages earlier, i.e.

liquids > 10 TBq 99Mo
solids > 1 TBq 137Cs
airborne > few tens GBq 131I

If the level of contamination exceeds the appropriate value, the rating for this criterion is Level 2. If it is less than this value, the rating based on this criterion is Level 0. Equally, even if it is 100 times the value, it is still Level 2.

Isotope Airborne based on I-131 Solid based on Cs-137 Liquid based on Mo-99
Am-241 2,000 4,000 50,000
Co-60 2 3 30
Cs-134 0.9 1 20
Cs-137 0.6 1 12
H-3 0.002 0.003 0.03
I-131 1 2 20
Ir-192 0.4 0.7 9
Mn-54 0.1 0.2 2
Mo-99 0.05 0.08 1
P-32 0.3 0.4 5
Pu-239 3,000 5,000 57,000
Ru-106 3 5 60
Sr-90 7 11 140
Te-132 0.3 0.4 5
U-235(S)a 600 900 11,000
U-235(M)a 200 300 3,000
U-235(F)a 50 90 1,000
U-238(S)a 500 900 10,000
U-238(M)a 100 200 3,000
U-238(F)a 50 100 1,000
Unat 600 900 11,000
Noble gases Negligible (effectively 0) Negligible (effectively 0) Negligible (effectively 0)

a - Lung absorption types: S - slow, M - medium, F - fast. If unsure, use most conservative value.