(Art. 24 para. 1 and 2)
Immission limits for air (LI air):
1.1 The immission limits for air are defined in such a way that permanent residence (8766 hours per year =PR ) at a location with an airborne activity concentration equal to the immission limit for a specific nuclide would lead, based on inhalation and immersion, to an annual dose of 0.3 mSv for the critical person: infant (eb), ten-year old child (e10) or adult (Ad).
1.2
| Nuclide | Immission limit for air [Bq/m3] | |||
|---|---|---|---|---|
| Ad | e10 | eb | Minimum | |
| HTO | 2.2E+03 | 2.3E+03 | 3.1E+03 | 2.2E+03 |
| C-14 (org1) | 6.8E+01 | 6.7E+01 | 9.3E+01 | 6.7E+01 |
| Na-22 | 2.7E+01 | 2.0E+01 | 1.9E+01 | 1.9E+01 |
| Na-24 | 6.4E+01 | 5.1E+01 | 4.8E+01 | 4.8E+01 |
| Mn-54 | 2.5E+01 | 2.1E+01 | 2.3E+01 | 2.1E+01 |
| Co-60 | 3.9E+00 | 3.5E+00 | 4.3E+00 | 3.5E+00 |
| Zn-65 | 2.4E+01 | 2.1E+01 | 2.2E+01 | 2.1E+01 |
| Br-82 | 4.7E+01 | 3.8E+01 | 3.9E+01 | 3.8E+01 |
| Sr-90/Y-90 | 1.1E+00 | 1.0E+00 | 1.3E+00 | 1.0E+00 |
| Tc-99m | 1.4E+03 | 1.2E+03 | 1.1E+03 | 1.1E+03 |
| I-131 (el2) | 2.0E+00 | 1.1E+00 | 9.3E-01 | 9.3E-01 |
| Cs-137/Ba-137m | 8.5E+00 | 1.4E+01 | 2.7E+01 | 8.5E+00 |
| Pu-239 | 7.9E-04 | 1.2E-03 | 1.9E-03 | 7.9E-04 |
1.3 The immission limits for air can be calculated for additional radionuclides using the following formula:
wheree inh,eb,e inh,e10ande inh,ad[mSv/Bq] are the inhalation dose coefficients for infants, ten-year-old children and adults, ande imm [(mSv/h)/(Bq/m3)] is the immersion dose coefficient (non-age-dependent). The inhalation and immersion dose coefficients are taken from Annexes 5 and 6.
For immersion, a shielding factor (F abs) of 0.4 is assumed for time spent indoors.
For breathing rates for infants, ten-year-old children and adults (DR eb,DR e10andDR ad[m3/a]), the following values (ENSI-G14) were used:
Immission limits for waters (LI eaux):
2.1 The immission limits for publicly accessible waters are defined in such a way that the critical person entirely meeting their need for drinking water with water contaminated at a level corresponding to the immission limit would thus receive an annual ingestion dose of 0.3 mSv.
2.2
| Nuclide | Immission limit for waters [Bq/l] | |||
|---|---|---|---|---|
| Ad | e10 | eb | Minimum | |
| HTO | 2.6E+04 | 2.0E+04 | 2.5E+04 | 2.0E+04 |
| C-14 | 8.0E+02 | 5.8E+02 | 7.5E+02 | 5.8E+02 |
| Na-22 | 1.4E+02 | 8.4E+01 | 8.0E+01 | 8.0E+01 |
| Na-24 | 1.1E+03 | 6.0E+02 | 5.2E+02 | 5.2E+02 |
| Mn-54 | 6.5E+02 | 3.6E+02 | 3.9E+02 | 3.6E+02 |
| Co-60 | 1.4E+02 | 4.2E+01 | 4.4E+01 | 4.2E+01 |
| Zn-65 | 1.2E+02 | 7.2E+01 | 7.5E+01 | 7.2E+01 |
| Sr-90/Y-90 | 1.6E+01 | 7.7E+00 | 1.6E+01 | 7.7E+00 |
| Tc-99m | 2.1E+04 | 1.1E+04 | 9.2E+03 | 9.2E+03 |
| I-131 (el) | 2.1E+01 | 8.9E+00 | 6.7E+00 | 6.7E+00 |
| Cs-137/Ba-137m | 3.6E+01 | 4.6E+01 | 1.0E+02 | 3.6E+01 |
| Pu-239 | 1.8E+00 | 1.7E+00 | 2.9E+00 | 1.7E+00 |
| Am-241 | 2.3E+00 | 2.1E+00 | 3.2E+00 | 2.1E+00 |
2.3 The immission limits for waters can be calculated for additional radionuclides using the following formula:
wheree ing,eb,e ing,e10ande ing,ad[mSv/Bq] are the ingestion dose coefficients for infants, ten-year-old children and adults, andCoE eb,CoE e10, andCoE adare the drinking water consumption in litres per year [l/a] for infants, ten-year-old children and adults.
For drinking water consumption, 650 l/a was assumed for adults and ten-year-old children, and 250 l/a for infants. The ingestion dose coefficients are taken from Annex 5.
In the case of nuclide mixtures, the summation rule applies for the immission limits for air and for waters: Rule used to assess compliance with immission limits for air and for waters in the case of nuclide mixtures. Here, the various nuclides are weighted according to the hazard they pose. If the following inequalities are satisfied, then the mixtures are below the immission limits.
a 1,a 2, …a n: airborne activity concentrations of nuclides 1, 2, …, n in Bq/m3.
LI air1,LI air 2, …LI air n: immission limits for air for nuclides 1, 2, …, n in Bq/m3.
a 1,a 2, …a n: airborne activity concentrations of nuclides 1, 2, ., n in Bq/l.
LI eau1,LI eau2, …LI eau n: immission limits for air for nuclides 1, 2, ., n in Bq/l.
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