acceptable risk

https://doi.org/10.1351/goldbook.15438
Probability of suffering disease or injury that is considered to be sufficiently small to be "negligible".
Note: Calculated risk of an increase of one case in a million people per year for cancer is usually considered to be negligible.
Source:
PAC, 2007, 79, 1153. (Glossary of terms used in toxicology, 2nd edition (IUPAC Recommendations 2007)) on page 1158 [Terms] [Paper]