The acceptability of liquid waste releases should be considered from both a health and an environmental point of view. Thresholds of chemical releases are defined by local regulations, generally on an annual (average) or daily (peak) basis. Radiological liquid wastes of an NPP are tritium, boron, iodine and other beta and gamma emitters. The daily limit for iodine release is set to 0.1 Bq/1, and 0.7 Bq/1 is the maximum for all other isotopes.