. The effects of atomic radiation on oceanography and fisheries, report . Figure 5. The Accumulation of Cesium^^^ by Clams as a Function of Time. Bay scallops immersed for two hours in sea water containing Zn^^ very rapidly accumulated this isotope. Table 4 lists the internal distribu- tion of zinc*'^ in the various tissues. The con- centration factor for each organ is readily cal- culated since the activity of the sea water was 10 m/iC/g. This means that the figures given in the second column divided by 10 equal the con- centration factors. The over-all concentration factor of the soft tissue
. The effects of atomic radiation on oceanography and fisheries, report . Figure 5. The Accumulation of Cesium^^^ by Clams as a Function of Time. Bay scallops immersed for two hours in sea water containing Zn^^ very rapidly accumulated this isotope. Table 4 lists the internal distribu- tion of zinc*'^ in the various tissues. The con- centration factor for each organ is readily cal- culated since the activity of the sea water was 10 m/iC/g. This means that the figures given in the second column divided by 10 equal the con- centration factors. The over-all concentration factor of the soft tissues of the bay scallop was 20 for this short interval. Other observations showed that these scallops contained close to 35,000y of zinc per gram (wet weight) and thus had a concentration factor for this element of about 3500. Oysters that were kept in sea water with added Zn^^ also quickly accumulated the iso- tope to very high levels. The zinc content of fresh oyster tissue measured almost 170,000y per gram. This represents a concentration fac- tor of 17,000, since the zinc concentration of the sea water in which the oysters lived was about 10 mcgm/1. Ruthenium^''^ was one of the separated fis- sion products used to study the uptake of par- ticulate radioisotopes by organisms in the sec- ond trophic level. Ruthenium was co-precipi- tated with calcium carbonate, dried, and ground TABLE 4 Distribution of Zn*^ in the Organs of The Bay Scallop After a Two Hour Immersion Tissue miic Zn®^/g. Total m/tc Kidney 1384 824 Liver 243 507 Gills 218 857 Testes and ovaries 138 193 Foot 131 25 Rectum 120 8 Heart 105 13 Adductor muscle 100 375 Mantle 92 321
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Keywords: ., bookcentury1900, booksubjectfisheries, booksubjectmarinebiology
