. The effects of atomic radiation on oceanography and fisheries, report. Marine biology; Radiation -- Physiological effect; Oceanography; Fisheries. Chapter 12 Tagged Water Masses for Studying the Oceans 127 locating gear, and careful crew training and teamwork are necessary for subsurface radio- logical surveys even at these moderate depths. Outline of tagging experiment in the thernio- cline layer Figure 2 illustrates certain features which must be considered in this region. The ship, A, may lower a gamma sonde through an activated pool and detect its presence by the receiving of a signal li
. The effects of atomic radiation on oceanography and fisheries, report. Marine biology; Radiation -- Physiological effect; Oceanography; Fisheries. Chapter 12 Tagged Water Masses for Studying the Oceans 127 locating gear, and careful crew training and teamwork are necessary for subsurface radio- logical surveys even at these moderate depths. Outline of tagging experiment in the thernio- cline layer Figure 2 illustrates certain features which must be considered in this region. The ship, A, may lower a gamma sonde through an activated pool and detect its presence by the receiving of a signal like tliat shown on the right side of the figure; the hydrographer may obtain a water sample by triggering electrically a water sampler at the moment the detector indicates that the sampler is within the active layer. The data in Table 3 make it clear that rapid response is important during this sort of measurement; a statistically significant signal must be accumu- lated in the short period during which the probe is passing through the active layer. Attention is called to the need for naviga- tional and maneuvering aids here by including schematically the parachute-drogue C. It is difficult to maneuver a weighted detector hori- zontally in order to study the lateral distribution in detail. The use is suggested of towed gamma detectors depressed to the desired level by hydrofoils controllable from the surface, more or less as illustrated schematically at the left of Figure 2. By means of a swivel-clamp, SC, a pennant several meters long containing a row of Geiger tubes or other gamma detectors, might be suspended above the depressor so as to pre- sent a vertical, linear array, thus giving a high probability of intersecting wide lateral distri- butions of activity. This sort of gear should not be too awkward nor fragile for deck handling at sea. Signals might be recorded partially, or entirely inside the depressor, or reported to the ship electronically or sonically. Ship A or a s
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