Thorium Measurement
Case (mBq/l)
upper limit (mBq/l)
By day (mBq/24h)
Case/limit ratio
Natural Th (mBq/l)
238Th
314.8
13.8
645.3
22.8
0
203Th
13.4
2.8
28.1
4.8
232Th
127
8.3
261
15.3
0.3