SHIPBOARD GAMMA RAY DETECTOR OF NUCLEAR WASTE IN THE SEA 
Sketches 
(To be provided) 
Primary Use: 
To be utilized on oceanographic survey ships for identifying and 
measuring abnormal gamma ray concentrations in the ocean areas, such 
as would result from nuclear powered vessel refuse and special con- 
centrations from other sources, such as nuclear waste dumping grounds 
and experimental nuclear tests conducted at sea. 
Requirements and Specifications: 
ae To perform reliably in depths of water varying from 0-6,500 
fathoms, in both coastal and oceanic regions. 
b. Sampling operation to be conducted with the ship stopped 
("lying-to") and when underway. 
c. Sensor module should contain, for example, a pressure protected 
6" X 9" sodium iodide or plastic scintillating crystal with its associated 
photomultipliers and pre-amplifiers. It should also include: 
(1) A device for indicating the depth of the module with an 
accuracy of +;% full range. 
(2) A discriminator analyzer element to discriminate gamma ray 
photon energye The range of this element should be not less than 100 
energy categories (channels). 
(3) A counting rate range selective from extreme sensitivity 
downward by at least 5 orders of magnitude and to incorporate the follow- 
ings 
(a) Should measure environmental gamma ray radiation in the 
ocean. oct ga aaa 
(b) Should incorporate a multi-range system for special cir- 
cumstances. 
(c) Should range from 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. 
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