with its associated photomultiplier s and preamplifiers. It should 

 also include: 



(1) A device for indicating the depth of the module with an 

 accuracy of ±1/4% full range. 



(2.) A discriminator analyzer element to discriminate 

 gamma ray photon energy. The range of this element should be 

 not less than 100 energy categories (channels). 



(3) A counting rate range selective from extreme sensitiv- 

 ity downward by at least 5 orders of magnitude and to incorporate 

 the following: 



(a) Should measure en\dronmental gamma ray radia- 

 tion in the ocean. 



(b) Should incorporate a multi-range system for 

 special circumstances. 



(c) Should range fromi below the natural background 

 of the ocean to 5 orders of magnitude higher gamma intensities. 



(4) Accessory equipment for analyzing a liquid or solid 

 sample on shipboard, including a well-shielded scintillating crystal 

 and electronic equipment connecting this to the shipboard pulse 

 analyzer . 



d. Shipboard Recording and Data Readout : 



(1) The data from this system should be one of the "inputs" 

 into the Master Shipboard Data Logging and Processing System. 



(2) This should include: (a) a multi-channel pulse height 

 analyzer with direct dial readout, (b) visual analog readout and 

 magnetic tape recording, (c) background storage and direct sub- 

 traction accessory. 



Potential Users and Estimiated Number of Units Which They May 

 Require: 



a. U. S. Navy (basic research, applied research, and'oceano- 

 graphic survey ships) - 20 to 40. 



b. U. S. Coast and Geodetic Survey - 10 to 20. 



c. Certain activities within scientific community - 10 to 20. 



d. Bureau of Commercial Fisheries - 2 to 8. 



383 



