THE DEEP WATER GAMMA-RADIOMETER AND THE MEASUREMENT OF RADIOACTIVITY OF BOTTOM LAYERS OF THE INDIAN OCEAN (Glubokovodnyi Gamma-Radiometer i Izmerenie Radioaktivnosti Glubinnykh Sloev Vody Indiiskogo Okeana),
NAVAL OCEANOGRAPHIC OFFICE NSTL STATION MS
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The operation of a new instrument known as the deep water gamma- radiometer RAG-1, which can measure radioactivity at great ocean depths, is described. The measurements were conducted from aboard the Soviet survey ship Vityaz in 1959-1960 during its 31st cruise in the Indian Ocean. The RAG-1 radiometer differs substantially from the earlier models in which the recording equipment was placed on shipboard and the radiation detector was submerged. Because of such structure, the depth of measurement was limited to several hundred meters. The new type is built so that the entire recording device together with transmitter can be submerged to great depths. Some typical samples of automatic measurements conducted at depths ranging from 1000 m to 4000 m are tabulated. The numerical values expressing impulses per minute and showing readings of counters are tabulated, compared for various depths, and analyzed with regard to the degree of accuracy.
- Physical and Dynamic Oceanography