33. 



the period January 1956 to September 1957. 



It is noted that at present production rates phosphorus and iodine 

 require the greatest dilution to reduce them to non-hazardous levels. 

 However, these elements unquestionably are not now a hazard since 

 their short half lives insure that during the time from production to 

 release to the environment most of the activity will have been destroyed. 



Strontium 90 appears as the most likely source of hazard, followed 

 by copper 64, cesium 137, and iron 59. 



The selection of possible disposal sites was guided by two features 

 in addition to those discussed above. They are the fishing intensity in 

 the various areas, and the location of submarine cables. The locations 

 of submarine cables are shown in Appendix VIII. A detailed summary of 

 fishing intensity has been prepared only for the coastal area from Hud- 

 son Canyon to Roseway. This infornnation is given in Appendix VII. 



Monitoring of disposal areas is an essential and somewhat difficult 

 part of the disposal problem. A discussion of this part of the problem 

 is given in Appendix VI. The monitoring consists of two steps, the 

 first of which is a pre-survey of any selected site. This survey has 

 three objects: to firmly establish background levels of radioactivity in 

 the area; to obtain rather detailed measurements of the bottom circu- 

 lation; and to obtain a census of bottom organisms that live in the 

 general region. The census will provide data concerning not only the 



