87:6227 Alpha tracks of sea sediment plutonium in cellulose nitrate film
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OLR (1987) 34 (I 1) C. Chemical Oceanography 947 87:6224 Kusakabe, M. et al., 1987. Distribution of ~°Be and 9Be in the Pacific Ocean. Earth planet. Sci. Lefts, 82(3-4) :231-240. The vertical distributions of ~°Be and 9Be at three locations in the Pacific (25°N, 170°E; 17°N, 118°W; 3°S, I17°W) are presented. The results show that both isotopes exhibit nutrient-like profiles. From the surface to the bottom, the increase for ~°Be is two- to threefold and that for 9Be is about fivefold. It is estimated that 70% to nearly 100% of ~°Be at the three stations are being recycled. The oceanic residence time of Be is of the order of 1000-4000 years, comparable to or slightly longer than the ocean mixing time. Dept. of Geolog. Sci., Univ. of Southern Calif., Los Angeles, CA 90089-0741, USA. 87:6225 Moore, W.S., 1987. Radium 228 in the South Atlantic Bight. J. geophys. Res., 92(C5):5177-5190. Mixing of the 228Ra signal offshore follows known circulation patterns and examination of the 22~Ra field as determined by the 228Ra/226Ra activity ratio (AR) reveals details of these patterns. During February, sinking of chilled shelf waters carries high AR water to just below the shelf break. In April, upwelling from 500-700 m brings low AR water to the shelf break, where it replaces the high AR waters. During August, low AR waters at the shelf break could be traced to the surface, where they separated higher AR waters both inshore and offshore of the shelf break. Because of such short-term variability, one-dimensional steady state models which balance 228Ra decay with mixing do not provide a true measure of horizontal mixing rates. Dept. of Geol., Univ. of South Carolina, Columbia, SC 29208, USA. 87:6226 Penrose, W.R., D.N. Metta, J.M. Hylko and L.A. Rinckel, 1987. The reduction of plutonium(V) by aquatic sediments. J. environ. Radioactivity, 5(3): 169-184. Argonne Natl. Lab., Environ. Res. Div., Argonne, IL 60439, USA. 87:6227 Portakal, S., R. Fukai and S. Ballestra, 1987. Alpha tracks of sea sediment plutonium in cellulose nitrate film. Int. J. Radiat. Appl. lnstrum. (Part A, Appl. Radiat. Isotopes), 38(4):295-296. Plutonium was isolated from sediment samples on an ion-exchange column and electrodeposited onto a stainless-steel disc. The discs were exposed to cellulose nitrate film. The tracks on the film were counted under a light-microscope. Cekmece Nuclear Res. and Training Center, PK.I, Havaalani, Istanbul, Turkey. 87:6228 Schulte, E.H. and P. Scoppa, 1987. Sources and behavior of technetium in the environment. Sci. total Environment, 64(1-2): 163-179. The chemical and physical properties of some technetium compounds are considered, and a dis- cussion of possible source terms is included. Lit- erature on environmental behavior of technetium is reviewed to evaluate its transfer and equilibrium distribution in aquatic and terrestrial ecosystems. Considerable effort has been expended recently in order to understand the biogeochemical processes responsible for the long-term behavior of technetium in the environment and its transfer through food chains as well as to identify critical pathways of the long-lived radioisotope Tc-99 from the environment to man. Comm. of the European Communities, c/o ENEA Centro Richerche Energia Ambiente, La Spezia, Italy. C130. Organic compounds 87:6229 Vernet, Maria and C.J. Lorenzen, 1987. The relative abundance of pheophorbide a and pheophytin a in temperate marine waters. Limnol. Oceanogr., 32(2):352-358. Pheophytin a and pheophorbide a were measured with reverse-phase, HPLC in samples from Dabob Bay, Puget Sound, Washington. Pheopigment diver- sity was higher than expected in all samples analyzed (water column, sediment trap material, and fecal pellets of Calanus pacificus): two major forms of pheophytin a and three major forms of pheophor- bide a were separated, quantified, and labeled by their relative polarity. Because of their field distri- butions, the more polar may be the more degraded forms of the chlorophyll molecule. Scripps Inst. of Oceanogr., La Jolla, CA 92093, USA. C140. Nutrients 87:6230 Pastuszak, Marianna, 1985. Distribution of some nutrients in the southern Baltic in Aug./Sept. 1983 in relation to conditions in two previous years. Oceanologia, Warsz., 21:77-98. Dept. of Oceanogr., Sea Fish. Inst., Gdynia, Poland.
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Transcript of 87:6227 Alpha tracks of sea sediment plutonium in cellulose nitrate film
OLR (1987) 34 (I 1) C. Chemical Oceanography 947
87:6224 Kusakabe, M. et al., 1987. Distribution of ~°Be and
9Be in the Pacific Ocean. Earth planet. Sci. Lefts, 82(3-4) :231-240.
The vertical distributions of ~°Be and 9Be at three locations in the Pacific (25°N, 170°E; 17°N, 118°W; 3°S, I17°W) are presented. The results show that both isotopes exhibit nutrient-like profiles. From the surface to the bottom, the increase for ~°Be is two- to threefold and that for 9Be is about fivefold. It is estimated that 70% to nearly 100% of ~°Be at the three stations are being recycled. The oceanic residence time of Be is of the order of 1000-4000 years, comparable to or slightly longer than the ocean mixing time. Dept. of Geolog. Sci., Univ. of Southern Calif., Los Angeles, CA 90089-0741, USA.
87:6225 Moore, W.S., 1987. Radium 228 in the South Atlantic
Bight. J. geophys. Res., 92(C5):5177-5190.
Mixing of the 228Ra signal offshore follows known circulation patterns and examination of the 22~Ra field as determined by the 228Ra/226Ra activity ratio (AR) reveals details of these patterns. During February, sinking of chilled shelf waters carries high AR water to just below the shelf break. In April, upwelling from 500-700 m brings low AR water to the shelf break, where it replaces the high AR waters. During August, low AR waters at the shelf break could be traced to the surface, where they separated higher AR waters both inshore and offshore of the shelf break. Because of such short-term variability, one-dimensional steady state models which balance 228Ra decay with mixing do not provide a true measure of horizontal mixing rates. Dept. of Geol., Univ. of South Carolina, Columbia, SC 29208, USA.
87:6226 Penrose, W.R., D.N. Metta, J.M. Hylko and L.A.
Rinckel, 1987. The reduction of plutonium(V) by aquatic sediments. J. environ. Radioactivity, 5(3): 169-184. Argonne Natl. Lab., Environ. Res. Div., Argonne, IL 60439, USA.
87:6227 Portakal, S., R. Fukai and S. Ballestra, 1987. Alpha
tracks of sea sediment plutonium in cellulose nitrate film. Int. J. Radiat. Appl. lnstrum. (Part A, Appl. Radiat. Isotopes), 38(4):295-296.
Plutonium was isolated from sediment samples on an ion-exchange column and electrodeposited onto a stainless-steel disc. The discs were exposed to cellulose nitrate film. The tracks on the film were counted under a light-microscope. Cekmece Nuclear Res. and Training Center, PK.I, Havaalani, Istanbul, Turkey.
87:6228 Schulte, E.H. and P. Scoppa, 1987. Sources and
behavior of technetium in the environment. Sci. total Environment, 64(1-2): 163-179.
The chemical and physical properties of some technetium compounds are considered, and a dis- cussion of possible source terms is included. Lit- erature on environmental behavior of technetium is reviewed to evaluate its transfer and equilibrium distribution in aquatic and terrestrial ecosystems. Considerable effort has been expended recently in order to understand the biogeochemical processes responsible for the long-term behavior of technetium in the environment and its transfer through food chains as well as to identify critical pathways of the long-lived radioisotope Tc-99 from the environment to man. Comm. of the European Communities, c /o ENEA Centro Richerche Energia Ambiente, La Spezia, Italy.
C130. Organic compounds
87:6229 Vernet, Maria and C.J. Lorenzen, 1987. The relative
abundance of pheophorbide a and pheophytin a in temperate marine waters. Limnol. Oceanogr., 32(2):352-358.
Pheophytin a and pheophorbide a were measured with reverse-phase, HPLC in samples from Dabob Bay, Puget Sound, Washington. Pheopigment diver- sity was higher than expected in all samples analyzed (water column, sediment trap material, and fecal pellets of Calanus pacificus): two major forms of pheophytin a and three major forms of pheophor- bide a were separated, quantified, and labeled by their relative polarity. Because of their field distri- butions, the more polar may be the more degraded forms of the chlorophyll molecule. Scripps Inst. of Oceanogr., La Jolla, CA 92093, USA.
C140. Nutrients
87:6230 Pastuszak, Marianna, 1985. Distribution of some
nutrients in the southern Baltic in Aug./Sept. 1983 in relation to conditions in two previous years. Oceanologia, Warsz., 21:77-98. Dept. of Oceanogr., Sea Fish. Inst., Gdynia, Poland.
