With the view to studying the possibility of separating uranium from sea-water by coprecipitation, the carrier properties of ferric, aluminium and titanium hydroxides were examined, with the following results:
(1) The values of pH at which uranium started to coprecipitate with the carriers were 4.5 for ferric hydroxide, 5.0 for aluminium hydroxide and 2.8 for titanium hydroxide.
(2) Optimum pH values for decarbonated sea-water to obtain maximum recovery of uranium were 8-9 for aluminium and ferric hydroxides, and 4.5-9 for titanium hydroxide with natural sea-water, the values were appreciably lower for ferric and aluminium hydroxides, but unchonged for titanium hydroxide.
(3) In the case of ferric and aluminium hydroxides, the coprecipitation ratios of uranium were much smaller in natural than in decarbonated sea-water. With titanium hydroxide however, uranium coprecipitated with equal ease in natural sea-water as in decarbonated sea-water.
(4) Uranium was effectively separated from the carri rs by carbonate salt extraction but not by acid extraction.

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Evaluation by out-of-pile heating experiment was made on two types of bismuth heat transfer bonding between powder compacted ceramic fuel and cladding, 1) vibration compaction of a mixture of ceramic fuel powder and bismuth powder in cladding tube, 2) vibration compaction of ceramic fuel powder in cladding tube with bismuth lamella formed on the inner surface of cladding. The principal results were as follows:
(1) In the first case of mixed UO2 and bismuth powder, the bismuth originally distributed in the central region of the compact (2, 600°-2, 700°C) evaporated and moved toward the periphery (800°-900°C) where it assembled to serve as good liquid heat transfer medium.
(2) In the second case, the bismuth lamella served as good liquid heat transfer medium without permeating into the inner regions of the compact.
(3) There was no appreciable reaction between the bismuth and UO2 up to 2, 600°- 2, 700°C, nor between the bismuth and UN or UC up to 1, 20O°-1, 300°C.

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Work on the thermoluminescent dosimeter is described under the headings of principles applied, characteristics, and comparison with other personnel monitors.
The author believes that the purpose of the personnel monitors is fo estimate at least the dose absorbed in each critical organ. It is possible to achieve this by using several thermoluminescent dosimeters simultaneously as personnel monitors.

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