IV-364 



TABLE IV. 5. 3 

 The 48-hour TLm for Shrimp for Selected Pesticides 

 (in micrograms/liter) 



in living tissue in quantities substantially above that of natural 

 background, is recognized as injurious (IV-5-1). Since some isotopes 

 may be extremely long-lived, and radionuclides may be cycled through 

 the food chain or recycled to the environment if the host expires, 

 the biological magnification factor is important. The potential con- 

 sequences of each particular radioisotope discharge must be evaluated 

 individually. The best rule is to minimize the amount of these 

 materials cycling in the environment. 



