Swiss limits for natural radionulides in drinking water
Group I :
Ra-224, Th-228
,
U-234
, U-235,
U-238
..................................Limit : sum
< 10 Bq/l
Group II :
Pb-210, Po-210
,
Ra-226
,
Ra-228
, Th-230, Th-232, Pa-231....Limit : sum
< 1 Bq/l
Nuclides to be determined mandatorily are marked in
bold
. If this first analysis shows values above 50% of the limits for one of the
groups the nuclides marked in
italic
have to be determined too. If this second analysis shows values above 75% of
the limits for one of the groups the remaining nuclides of this group have to
be measured.
Drinking water means any water used for human consumption, including bottled
mineral waters.