• Césium 137 — Wikipédia

    PropriétésCaractéristiquesUtilisationsRésultatsÉcologieDiagnosticEffets secondairesToxicitéLocalisationÉpidémiologieEnvironnementEffetsCausesTraitementSantéPréventionFormationObjectifsLe césium 137, noté 137Cs, est l'un des 40 isotopes du césium connus, élément qui a le plus grand nombre d'isotopes après le francium. C'est lisotope du césium dont le nombre de masse est égal à 137 : son noyau atomique compte 55 protons et 82 neutrons avec un spin 7/2+ dans son état fondamental pour une masse atomique de 136,907 083 5 g/mol. Sa période est de 30,15 ans. Son point de fusion est assez proche de la température ambiante (CATP) pour qu'il soit possible de l'obtenir à l'état liquide à cette te
  • Césium 137 V4 IRSN

  • Césium — Wikipédia

    C'est dans les écosystèmes forestiers que le césium 137 se montre le plus durablement présent (il y est moins lessivé), biodisponible et localement en voie de concentration (dans les régions où il a plu lors du nuage de Tchernobyl, les sols forestiers sont devenus le principal stock de césium, et notamment dans les creux et en montagne en pied de versant où il a pu s'accumuler au point d'y voir la radioactivité

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  • The Distribution of Fallout Cesium‐137 in Southern

    Abstract Cesium‐137 is a radioactive fallout isotope that is strongly adsorbed by soil particles and has been used by numerous researchers to estimate soil erosion and deposition. In this study, ba

  • Cited by: 55
  • Distribution and budget of 137 Cs in the China Seas

    29/05/2020· Cesium–137 is one of the most abundant anthropogenic radionuclides released by atmospheric nuclear testing and nuclear accidents, and accordingly it may

  • Cited by: 1
  • Cs-137 distribution in forest floor and surface soil

    01/02/2008· The tendency of cesium distribution in forest floor in natural ecosystems from Rila Mountain is quite similar in contrast to the plantations, where the activity concentration of Cs-137 in forest floor is lower. In Central Balkan the layers of forest floor are stronger contaminated with cesium. For this region we can distinguish also two groups in respect to tendencies in Cs-137 distribution in forest

  • Cited by: 30
  • Caesium-137 Wikipedia

    Caesium-137, or radiocaesium, is a radioactive isotope of caesium which is formed as one of the more common fission products by the nuclear fission of uranium-235 and other fissionable isotopes in nuclear reactors and nuclear weapons. Trace quantities also originate from natural fission of uranium-238. It is among the most problematic of the short-to-medium-lifetime fission products because it easily moves

  • Names: caesium-137, Cs-137
  • Cesium-137 Cs PubChem

    Cesium-137 is produced in nuclear fission and occurs in atmospheric debris from weapons tests and accidents. It is a very important component of radioactive fallout; and because of its moderately long half-life and high solubility, it is a major source of long-lived external gamma radiation from fallout. It accounts for 30 percent of the gamma activity of fission products stored for one year, 70 percent in two years,

  • Radioactivity : Chernobyl Caesium-137

    A French respected intitution, the IRSN, estimates that 80,000 TBq of caesium-137 were released into the environment, which correspond to 30 to 40% of the amount present in the damaged reactor core. Caesium has disappeared since a long time from the atmosphere when it deposited on the ground. Almost all deposits are found in shallow depth, because migration of this chemical element with

  • Source evaluation of 137 Cs in stuffs based on trace

    14/11/2018· Comparison of distribution of the radioactivity of the detected sum of 134 Cs and 137 Cs (radiocesium) in 2014 (closed ) and 2016 (open circle),

  • Cs-137 distribution in forest floor and surface soil

    01/02/2008· The tendency of cesium distribution in forest floor in natural ecosystems from Rila Mountain is quite similar in contrast to the plantations, where the activity concentration of Cs-137 in forest floor is lower. In Central Balkan the layers of forest floor are stronger contaminated with cesium. For this region we can distinguish also two groups in respect to tendencies in Cs-137 distribution in

  • Dynamic depth distribution of cesium-133 near soil

    Various 137 Cs conversion models have been used to predict soil erosion. A knowledge of the initial distribution of 137 Cs is vital to improve soil loss prediction. The objectives were to (1) characterize the dynamic distributions of 133 Cs near the soil surfaces in multiple rains spiked with 133 Cs using a rainfall simulator, and (2) further estimate the relaxation mass depth (H) for use in

  • Strontium-90 and cesium-137 distribution in Baltic Sea

    The authors compare data from the literature with data taken in the fall of 1984 on the concentrations of cesium 137, strontium 90, cesium 144, and tritium in the waters of the Baltic and North seas. Sampling was conducted along the coastal regions as well as offshore and the consequent concentration and distribution profiles are mapped.

  • Tracing radioactive cesium in stem of three Japanese

    12/06/2020· Radioactive cesium (137 Cs) The radial distribution of 137 Cs activity concentration in stem varied not only among species, but also among trees of the same species collected from different sites and among vertical positions of the stem within tree (Fig. 2). Nevertheless, the radial distribution at the same sampling height showed high reproducibility among trees from the same

  • Cesium‐137 Distribution in a California Pelloxerert

    The distribution of 137 Cs activity in soils provides a means of assessing physical transport of soil particles. We measured the activity of 137 Cs along cracks and within peds of a Chromic Pelloxerert on the flood plain of an ephemeral stream in the Central Valley of California to assess the role of pedoturbation in the formation of a Vertisol. The 137 Cs activity is highest in the upper 10

  • Distribution of Cs-137 and dose rate investigation in the

    Broesus RW, Cesium-137/Strontium-90 ratios in Milk and Grass from Jamaica, 1970, New York University: New York. Takenaka C, Onda Y, and Hamajima Y (1998) Distribution of Cesium-137 in Japanese Forest Soils: Correlation with the contents of Organic Carbon. Sci Total Environ 222: 193-9. 00305-2 View Article ; Miller M,Voutchkov M (2014) Evaluation of Gamma Activities of Naturally

  • Les isotopes du césium. Césium-133, le césium 134, le

    la césium (Dans le tableau périodique Cs) A 40 isotopes Remarque. leur masse atomique Il varie de 112 à 151. Un isotope, 133 Cs, est stable. la radioisotopes à la vie plus sont 135 Cs (demi-vie de 2,3 millions d'années), la 137 Cs (de 30.1671 ans et demi-vie) et 134 Cs (demi-vie de 2.0652 ans). Tous les autres isotopes ont une demi-vie de moins de deux semaines, beaucoup de ces bas par heure.

  • Distribution of Cs 137 and dose rate investigation in the

    A study of the distribution of Cs-137 in Japanese forest soils found that the average activity concentra-tion of 16 samples around a tree was 42.4 Bq/kg and a standard deviation of 25.9 Bq/kg. This finding indi-cates the importance in the selection of sampling sites and the number of samples from the surface soils es- pecially around trees [27]. Szabo et al showed that about 78% of the total

  • Source evaluation of 137 Cs in stuffs based on trace

    14/11/2018· We performed gamma-ray analysis to determine the amount of radioactive cesium-134 (134Cs) and cesium-137 (137Cs) in 259 stuffs five years after

  • Radioactivity : Chernobyl Caesium-137

    More than twenty years after the Chernobyl accident, attention focuses mainly on one particular radioactive nucleus : caesium-137. Iodine-131, dreadful in the weeks following the disaster, has disappeared because of its 8 days radioactive half-life (or period).On the contrary, because of their periods of thirty years, the effects of cesium-137, and to a lesser degree those of one other