Radionuclides in plankton near the Marshall Islands, 1956 / by Frank G. Lowman.

Abstract

Radiochemical separations were made on plankton samples collected in and vest of the Enlwetok Proving Ground in September 1956. Ion exchange resin column and precipitation techniques were used. Fission products, mainly Zr95-ifb^5 and Cel^^-Pr^^^, contributed an average of 29 per cent of the total radioactivity. The remaining 71 per cent of the activity was contributed by the non-fission radioisotopes Zn^5, Co57, 58,60, Fe55 and Mn5^. Radioactive zinc, cobalt, and iron accounted for averages of 2k, 26 and 21 per cent respectively of the total radioactivity. Mn^^was present in trace amounts. Variations in ratio of occurrence for the different non-fission products with change in geographical location was observed. Relatively high levels of Zn"5 were centered in the area near Bikini and Enlwetok Atolls. The area of high levels of radioactive cobalt and iron in comparison to Zn"5 was located approximately 480 miles west and slightly north of Enlwetok Atoll.

Monitoring of the aquatic environment by species accumulator of pollutants: a review

“…On the other hand, in the gut content of planktivorous fishes the amount of zooplankton is equivalent to that living in several cubic meters of water. Lowman (1958) detected radiomanganese ( 54 Mn) from fall-out in plankton samples from the Marshall Islands, in an area near to the zero point of a nuclear explosion. Acantharia (planktonic protozoa), which have a celestine (SrSO 4 ) shell, have been used by Schreiber (1967) to monitor fall-out radiostrontium ( 90 Sr) in the Adriatic and Tyrrenian Seas.…”

Importance and Difficulties of Research on Metal Speciation in the Aquatic Ecosystem: an Ecologist's Viewpoint

“…In this case bioaccumulators are used as an "early warning" system. [33][34][35] In addition, useful information may be obtained by adopting "active biomonitoring", which consists in transferring bioaccumulators from a clean environment to a polluted one to be monitored. 36,37 This type of technique, as well as producing useful information on the contamination level of the environment, may be used to estimate the uptake-rate of various pollutants in the bioaccumulators by analysing periodically sampled individuals.…”

Effect of weight change on the performance of autumn-calving suckler cows

“…The intake of silage by calves was measured over a 4-day period at intervals of 2 weeks throughout the winter. The condition score of cows was assessed (Lowman, Scott & Somerville, 1973) in mid-April, late August and early November each year.…”