International Commission on Radiological Protection
Although few people come in contact with fermium, the International Commission on Radiological Protection has set annual exposure limits for the two most stable isotopes. For fermium-253, the ingestion limit was set at 107 becquerels (1 Bq is equivalent to one decay per second), and the inhalation limit at 105 Bq; for fermium-257, at 105 Bq and 4000 Bq respectively.