Treatment of Grass Sample Results
I. Divide activity per m2 by the lower DERL for the relevant isotope taken
from the table below.
2.
Express the result in DERL's (Milk) or DERL's (Veg) as appropriate.
Isotope
Lower DERL (Bq m−2)†
Basis
Sr-89
1.8 X 106
Milk
Sr-90
1.0 X 105
Milk
Ru-103
1.7 X 107
Veg
Ru-106
1.2 X 106
Veg
I-131
1.3 X 104
Milk
1-133
7.2 X 105
Milk
Cs-134
3.1 X 104
Milk
Cs-137
3.5 X 104
Milk
Pu-239
1.0 X 106
Veg
Pu-240
1.0 X 106
Veg
Am-241
2.0 X 104
Veg
+ DERI value as given in reference 20.
'
104
{