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AbstractAbstract
[en] The age of a deep-sea clam, Tindaria callistiformis, from 3800 m depth has been determined by 228Ra(6.7 year half-life) chronology of separated size fractions of a captured population. A length of 8.4 mm is attained in about 100 years. Shells of this size fraction show about 100 regularly spaced bands, indicating that the growth feature may be an annual one. (auth)
Original Title
Tindaria callistiformis
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Journal Article
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Proceedings of the National Academy of Sciences of the United States of America; v. 72(7); p. 2829-2832
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AbstractAbstract
No abstract available
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Journal Article
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Journal of Radioanalytical Chemistry; v. 5 p. 127-129
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AbstractAbstract
[en] The present occurrence of 226Ra and 228Ra in marine sediment core and fish from the Exclusive Economic Zone in the east coast of Peninsular Malaysia were studied. Sediment core and biota in respectively was collected using multicorer device and purchased from local fishermen at identified stations during the cruise expedition conducted in 2008. The purpose of this study was to determine and to make available an inventory of activity concentration levels and activity ratio for these radionuclides in this region. The activity concentrations of 226Ra and 228Ra in sediment core and edible part of fish were ranged between 15.9-46.5 and 27.7-87.1 Bq/kg dry wt and; 0.80-2.13 and <0.95-3.57 Bq/kg fresh wt, respectively. Meanwhile, the activity ratios of 228Ra/226Ra in sediment core and fish were varied with the range between 1.63-2.09 and 0.45-2.38, respectively. Refer to those ranges the activity concentrations of radium isotopes were comparable with other region. Thus, it can be concluded that the occurrence of radium isotopes mainly supplied from terrestrial sources and the factors of assimilation efficiency and transfer coefficient of radium may probably effect to the variation activity concentration of 226Ra and 228Ra and its activity ratio in edible part of pelagic and demersal fish obtained in this study. (author)
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Source
46 refs.
Record Type
Journal Article
Journal
Journal of Radioanalytical and Nuclear Chemistry; ISSN 0236-5731;
; CODEN JRNCDM; v. 292(1); p. 183-192

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ALKALINE EARTH ISOTOPES, ALPHA DECAY RADIOISOTOPES, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, CARBON 14 DECAY RADIOISOTOPES, EVEN-EVEN NUCLEI, HEAVY ION DECAY RADIOISOTOPES, HEAVY NUCLEI, INTERNAL CONVERSION RADIOISOTOPES, ISOTOPES, NATIONAL ORGANIZATIONS, NUCLEI, RADIOISOTOPES, RADIUM ISOTOPES, YEARS LIVING RADIOISOTOPES
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AbstractAbstract
No abstract available
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Journal Article
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Earth and Planetary Science Letters; v. 16(3); p. 421-422
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AbstractAbstract
[en] Surface samples of sea water collected from the Seto Inland Sea and the Japan Sea were analyzed for radium isotopes by using γ-ray spectrometry and 228Th milking method. The concentrations of 228Ra in the Seto Inland Sea water ranged from 839 to 417 dpm/1000 l and were much higher than those of open ocean water. The Inland Sea water contained 226Ra ranging from 190 to 134 dpm/1000 l and was somewhat enriched in 226Ra as compared with the Pacific Ocean Water. In the Kii Channel 228Ra concentrations of surface water varied from 333 to 48 dpm/1000 l and generally decreased away from the Inland Sea. It is suggested that the distribution of 228Ra in the Seto Inland Sea is influenced by the inflow of open ocean water from the Kii and Bungo Channels. (author)
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Journal Article
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Kobe Shosen Daigaku Kiyo, Dai-2-Rui; ISSN 0450-609X;
; (no.27); p. 109-115

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AbstractAbstract
No abstract available
Original Title
Determinacao de Ra-226 e Ra-228 em gesso
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Source
36. Annual Meeting of the Brazilian Society for the Advancement of Science; Sao Paulo, SP (Brazil); 4-11 Jul 1984; Published in summary form only.
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Journal Article
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Conference
Journal
Ciencia e Cultura. Suplemento; ISSN 0102-2474;
; v. 36(7); p. 428

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LanguageLanguage
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Godoy, J.M.; Schuettelkopf, H.
Kernforschungszentrum Karlsruhe G.m.b.H. (Germany, F.R.). Hauptabteilung Sicherheit1983
Kernforschungszentrum Karlsruhe G.m.b.H. (Germany, F.R.). Hauptabteilung Sicherheit1983
AbstractAbstract
[en] After radiochemical cleaning of radium, a solution with sodium salicylate as wavelength-shifting compound is measured. The chemical yield is determined using barium carrier. With high counting efficiency a lower detection limit of 0.44 pCi/sample can be achieved, using a counting time of 1000 min. Disturbances by Ra-226 and Ra-224 can be prevented by simple means. The application of the method to standard samples and the comparison with other methods demonstrated good results. (orig./HP)
[de]
Nach radiochemischer Reinigung der Radiumfraktion wird eine Loesung mit Natriumsalicylat als Wellenlaengenschieber gemessen. Die chemische Ausbeute wird ueber Barium bestimmt. Mit hohem physikalischen Wirkungsgrad kann eine Nachweisgrenze von 0,44 pCi/Probe bei 1000 min Messzeit erreicht werden. Die Stoerung durch Ra-226 und Ra-224 kann durch einfache Massnahmen vermieden werden. Die Anwendung der Methode auf Standardproben und der Vergleich mit anderen Messmethoden haben gute Uebereinstimmung erbracht. (orig./HP)Original Title
Bestimmung von Ra-228 durch Messung der Cerenkov-Strahlung des Ac-228
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Apr 1983; 14 p
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Report
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AbstractAbstract
[en] Surface sediment samples were collected at the West (east coast and west coast of Peninsular Malaysia) and East (Sabah and Sarawak) Malaysia in several expeditions within August 2003 until June 2008 for determining the level of natural radium isotopes. Activity concentrations of 226Ra and 228Ra in surface marine sediment at 176 sampling stations were measured. The activity concentrations of both radionuclides in Malaysia (East and West Malaysia) display varied with the range from 9 to 158 Bq/kg dry wt. and 13 to 104 Bq/kg dry wt., respectively. Meanwhile, the ratio distributions of 228Ra/226Ra were ranged from 0.62 to 3.75. This indicated that the ratios were slightly high at west coast of Peninsular Malaysia compared to other regions (east coast of Peninsular Malaysia, Sabah and Sarawak). The variation of activity concentrations of 226Ra and 228Ra and its ratios were also supported by the statistical analyses of one-way ANOVA and t test at 95 % confidence level, whereby there were proved that the measured values were different between the regions. These different were strictly related to their half-life, potential input sources (included their parents, 238U and 232Th), parent's characteristic, the geological setting/formation of the study area, environment origin and behavior. (author)
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Source
27 refs.
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Journal Article
Journal
Journal of Radioanalytical and Nuclear Chemistry; ISSN 0236-5731;
; CODEN JRNCDM; v. 295(2); p. 1465-1472

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ALKALINE EARTH ISOTOPES, ALPHA DECAY RADIOISOTOPES, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, CARBON 14 DECAY RADIOISOTOPES, CHEMISTRY, EVEN-EVEN NUCLEI, HEAVY ION DECAY RADIOISOTOPES, HEAVY NUCLEI, INTERNAL CONVERSION RADIOISOTOPES, ISOTOPES, NATIONAL ORGANIZATIONS, NUCLEI, RADIOISOTOPES, RADIUM ISOTOPES, YEARS LIVING RADIOISOTOPES
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Sahu, A.; Vidyasagar, D.; Tripathy, S.K.; Behera, S.; Patro, P.N., E-mail: abinash_sahu31@yahoo.co.in
Proceedings of the international conference on radiological safety in workplace, nuclear facilities and environment: book of abstracts2016
Proceedings of the international conference on radiological safety in workplace, nuclear facilities and environment: book of abstracts2016
AbstractAbstract
[en] Radium was identified as a significant environmental pollutant in the 1950s and since then has been primarily studied due to its hazard to human health. There are four naturally occurring radium isotopes, of these radium-226 ("2"2"6Ra) and radium-228 ("2"2"8Ra) have been the most widely studied as they are the most radiotoxic. "2"2"8'Ra is of main concern in IREL, OSCOM as it is the decay product of "2"3"2Th and the ore of which (Monazite) is processed here. The concerning reasons for "2"2"8Ra are: its relatively short half-life, emitted beta particles have a high potential for causing biological damage, short lived alpha-emitting daughters will build up over approximately 10 years if "2"2"8Ra is trapped in the body. Determination of "2"2"8'Ra has been an important part of the monitoring and research program of the Environmental Radiological Laboratory of HPU, IREL, OSCOM
Primary Subject
Source
Indian Association for Radiation Protection, Mumbai (India); 287 p; 2016; p. 60; IARPIC-2016: 32. international conference on radiological safety in workplace, nuclear facilities and environment; Kalpakkam (India); 22-25 Feb 2016; 2 refs., 1 tab.
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Book
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Conference
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AbstractAbstract
[en] Improvements in the analyses of 226Ra and 228Ra in seawater made possible by better extraction and processing techniques reduce significantly the errors associated with these measurements. These improvements and the extensive sampling for Ra isotopes conducted on the TTO North Atlantic Study should enable us to use the distribution of 228Ra to study mixing processes on a 3-15 year time scale in both the upper and deep North Atlantic. The 228Ra profiles already analyzed show a closer resemblance to GEOSECS tritium data than to TTO tritium data in the upper ocean. This is because the transient tracer tritium was responding on a 10-year time scale during GEOSECS and a 20-year time scale during TTO. The steady state tracer 228Ra should always respond on a time scale of 8 years. Thus the 228Ra data obtained on TTO should provide a means to extend the features of the GEOSECS tritium field to the regions of the TTO study. The 226Ra data are of high enough quality to identify features associated with different water masses. Changes in the positions of the deep-water masses since the GEOSECS cruise are revealed by the 226Radata
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