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Journal of Environmental Radioactivity

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https://www.readbyqxmd.com/read/28734163/world-wide-seasonal-variation-of-7-be-related-to-large-scale-atmospheric-circulation-dynamics
#1
Lucrezia Terzi, Martin Kalinowski
No abstract text is available yet for this article.
July 19, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28728129/a-finite-element-model-development-for-simulation-of-the-impact-of-slab-thickness-joints-and-membranes-on-indoor-radon-concentration
#2
E Muñoz, B Frutos, M Olaya, J Sánchez
The focus of this study is broadly to define the physics involved in radon generation and transport through the soil and other materials using different parameter-estimation tools from the literature. The effect of moisture in the soil and radon transport via water in the pore space was accounted for with the application of a porosity correction coefficient. A 2D finite element model is created, which reproduces the diffusion and advection mechanisms resulting from specified boundary conditions. A comparison between the model and several analytical and numerical solutions obtained from the literature and field studies validates the model...
July 17, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28728128/radionuclide-biokinetics-in-the-russian-sturgeon-and-phylogenetic-consistencies-with-cartilaginous-and-bony-marine-fishes
#3
Ross A Jeffree, Scott J Markich, Francois Oberhaensli, Jean-Louis Teyssie
The biokinetics of eight radionuclides ((241)Am, (109)Cd, (134)Cs, (75)Se, (54)Mn, (110m)Ag, (65)Zn, (60)Co) absorbed from the aquatic medium by juvenile Russian sturgeon (Acipenser gueldenstaedtii) were experimentally determined in fresh (0.42‰) and brackish (9.0‰) waters, of a similar salinity range to the Caspian Sea, and in conjunction with chemical speciation modelling. Uptake and loss rate constants were determined for each radionuclide for a 14 day exposure at each salinity and during 28 days of exposure to radionuclide-free conditions...
July 17, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28728127/is-bacterial-luminescence-response-to-low-dose-radiation-associated-with-mutagenicity
#4
T V Rozhko, O A Guseynov, V E Guseynova, A A Bondar, A N Devyatlovskaya, N S Kudryasheva
Luminous marine bacteria are widely used in bioassays with luminescence intensity being a physiological parameter tested. The purpose of the study was to determine whether bacterial genetic alteration is responsible for bioluminescence kinetics change under low-dose radiation exposure. The alpha-emitting radionuclide (241)Am and beta-emitting radionuclide (3)H were used as the sources of low-dose ionizing radiation. Changes of bioluminescence kinetics of Photobacterium phosphoreum in solutions of (241)Am(NO3)3, 7 kBq/L, and tritiated water, 100 MBq/L, were studied; bioluminescence kinetics stages (absence of effect, activation, and inhibition) were determined...
July 17, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28719853/determination-of-chemical-forms-of-14-c-in-liquid-discharges-from-nuclear-power-plants
#5
I Svetlik, M Fejgl, P P Povinec, T Kořínková, L Tomášková, J Pospíchal, M Kurfiřt, R Striegler, M Kaufmanová
Developments of radioanalytical methods for determination of radiocarbon in wastewaters from nuclear power plants (NPP) with pressurized light water reactors, which would distinguish between the dissolved organic and inorganic forms have been carried out. After preliminary tests, the method was used to process pilot samples from wastewater outlets from the Temelín and Dukovany NPPs (Czech Republic). The results of analysis of pilot water samples collected in 2015 indicate that the instantaneous (14)C releases into the water streams would be about 7...
July 15, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28719852/rapid-gamma-spectrometric-analysis-of-soil-samples-after-radioactive-fallout-using-a-conjugate-view-technique
#6
M Isaksson, M Fahlström, N Ossipova, K Rosén
A method for fast determination of the activity in soil samples by measuring a fresh soil core sample from both ends with an HPGe-detector is proposed. The method was tested by simulations, as well as by measurements on spiked soil samples. Both simulations and measurements showed that the geometrical mean of the count rates when the sample is measured twice, with the bottom and the top end, respectively, facing the detector closely resembles the count rate from a measurement on a homogenized sample. Therefore, an efficiency calibration for homogenized samples could be used even if the activity is highly inhomogeneous in the soil core, as is the case with fresh fallout...
July 15, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28715670/estimated-lifetime-effective-dose-to-hunters-and-their-families-in-the-three-most-contaminated-counties-in-sweden-after-the-chernobyl-nuclear-power-plant-accident-in-1986-a-pilot-study
#7
Martin Tondel, Christopher Rääf, Robert Wålinder, Afrah Mamour, Mats Isaksson
Hunters and their families were one of the most exposed subpopulations in Sweden after the Chernobyl nuclear power plant accident in 1986. In this pilot study we used existing registries and whole-body measurements to develop algorithms to calculate lifetime effective doses and collective doses to some hunters in Sweden. Ten hunters and their family members were randomly selected from each of the three most contaminated counties in Sweden (Västernorrland, Uppsala, Gävleborg) using the register for hunting weapons from the Police Authority in 1985...
July 14, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28711775/natural-and-artificial-radionuclides-in-sludge-sand-granular-activated-carbon-and-reverse-osmosis-brine-from-a-metropolitan-drinking-water-treatment-plant
#8
Dani Mulas, Antonia Camacho, Isabel Serrano, Sergio Montes, Ricard Devesa, Maria Amor Duch
No abstract text is available yet for this article.
July 13, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28711774/a-rotating-slit-collimator-based-gamma-radiation-mapper
#9
Jonas M C Nilsson, Robert R Finck, Christopher L Rääf
For situations with radioactive material out of control where it may be physically difficult or prohibited to access areas close to the source, measurements from distance may be the only way to assess the radiation environment. Using collimated detectors will provide means to locate the direction of the radiation from the source. To investigate the possibilities of mapping gamma emitting radioactive material in a closed non-enterable area, a tentative system for mapping radioactive materials from a distance was built...
July 13, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28711773/plants-as-indicators-of-tritium-concentration-in-ground-water-at-the-semipalatinsk-test-site
#10
N V Larionova, S N Lukashenko, O N Lyakhova, A O Aidarkhanov, S B Subbotin, A B Yankauskas
No abstract text is available yet for this article.
July 13, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28711772/study-of-the-formation-of-the-primary-137-cs-vertical-profile-in-the-organic-matter-rich-sediments
#11
N Tarasiuk, B Lukšienė, E Maceika, V Filistovičius, Z Žukauskaitė, L Nedzveckienė, Š Buivydas
A laboratory study of the formation of the primary vertical profile of the (137)Cs activity concentration in the anaerobic organic matter-rich sediments was carried out. The incubation was performed using sediment baths method (initial thickness of the water layer over the sediments ∼40 cm, initial radiocesium activity concentration in water ∼14.53 Bq·L(-1)). An exponential profile (R(2)∼0.999) with the half-height width of ∼0.65 cm was formed after ∼32 days of the incubation. A further course of the experiment (sediments were sampled after 64, 130 and 293 days of the incubation) revealed deviations in the form of the radiocesium activity concentration profile related to the appearance of the additional Gauss factor with the increasing half-height width of ∼1...
July 13, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28711160/-7-be-and-210-pb-wet-dry-deposition-in-melbourne-australia-and-the-development-of-deployable-units-for-radiological-emergency-monitoring
#12
Jane Courtier, Sandra Sdraulig, Gillian Hirth
A large stainless-steel collection tray (with a surface area of one square metre) was purpose built and mounted on the roof of the Australian Radiation Protection and Nuclear Safety Agency (ARPANSA) building at Yallambie, Victoria, Australia. Using this system two years' worth of wet/dry deposition samples have been collected and analysed. Smaller portable units were also developed for deployment in an emergency and/or for environmental monitoring. The cosmogenic radionuclide (7)Be and the naturally occurring terrestrial radionuclide (210)Pb have been used to validate the systems...
July 12, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28692936/tritium-forms-discrimination-in-ryegrass-under-constant-tritium-exposure-from-seed-germination-to-seedling-autotrophy
#13
H Renard, D Maro, S Le Dizès, A Escobar-Gutiérrez, C Voiseux, L Solier, D Hébert, M Rozet, C Cossonnet, R Barillot
Uncertainties remain regarding the fate of atmospheric tritium after it has been assimilated in grasslands (ryegrass) in the form of TFWT (Tissue Free Water Tritium) or OBT (Organically Bound Tritium). One such uncertainty relates to the tritium forms discrimination during transfer from TFWT to OBT resulting from photosynthesis (OBTphoto), corresponding to the OBTphoto/TFWT ratio. In this study, the OBT/TFWT ratio is determined by experiments in the laboratory using a ryegrass model and hydroponic cultures, with constant activity of tritium in the form of tritiated water (denoted as HTO) in the "water" compartment (liquid HTO) and "air" compartment (HTO vapour in the air)...
July 6, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28689881/comparison-of-radium-228-determination-in-water-among-australian-laboratories
#14
Atun Zawadzki, Megan Cook, Brodie Cutmore, Fiona Evans, Daniela Fierro, Alicea Gedz, Jennifer J Harrison, Tom Loosz, Peter Medley, Lida Mokhber-Shahin, Sarah Mullins, Sandra Sdraulig
The National Health and Medical Research Council and Natural Resource Management Ministerial Council of Australia developed the current Australian Drinking Water Guidelines which recommend an annual radiation dose value of 1 mSv year(-1). One of the potential major contributors to the radiation dose from drinking water is radium-228, a naturally occurring radionuclide arising from the thorium decay series. Various methods of analysing for radium-228 in water have been established and adapted by analytical radiochemistry laboratories...
July 6, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28689161/atmospheric-tritium-concentrations-under-influence-of-areva-nc-la-hague-reprocessing-plant-france-and-background-levels
#15
O Connan, D Hébert, L Solier, D Maro, G Pellerin, C Voiseux, M Lamotte, P Laguionie
In-air tritium measurements were conducted around the AREVA NC La Hague reprocessing plant, as well as on other sites that are not impacted by the nuclear industry in northwest of France. The results indicate that the dominant tritium form around the AREVA site is HT (86%). HT and HTO levels are lower than 5 and 1 Bq. m(-3) for hourly samples taken in the plume. No tritiated organic molecules (TOM) were detected. 26 measurement campaigns were performed and links were established between near-field (85)Kr, HT and HTO activities...
July 6, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28688292/impact-of-air-masses-on-the-distribution-of-210-pb-in-the-southeast-of-iberian-peninsula-air
#16
E Chham, F Piñero-García, P González-Rodelas, M A Ferro-García
The current research has been developed in the southern of the Iberian Peninsula in order to better understand the atmospheric processes and also the influence of the air masses origin and pathways in the transport of (210)Pb-aerosols in the atmosphere. Simultaneous measurements of the radionuclides (7)Be and (210)Pb on airborne have been routinely carried out at Granada (Spain 37.177N, 3.598 W, 687 m a.s.l.) from 2010 to 2014. The long term monitoring evolution on (210)Pb is discussed in this study and also the useful ratio (7)Be/(210)Pb...
July 5, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28687277/measurement-of-tributyl-phosphate-tbp-in-groundwater-at-a-legacy-radioactive-waste-site-and-its-possible-role-in-contaminant-mobilisation
#17
Brett Rowling, Andrew S Kinsela, M Josick Comarmond, Catherine E Hughes, Jennifer J Harrison, Mathew P Johansen, Timothy E Payne
At many legacy radioactive waste sites, organic compounds have been co-disposed, which may be a factor in mobilisation of radionuclides at these sites. Tri-butyl phosphate (TBP) is a component of waste streams from the nuclear fuel cycle, where it has been used in separating actinides during processing of nuclear fuels. Analyses of ground waters from the Little Forest Legacy Site (LFLS) in eastern Australia were undertaken using solid-phase extraction (SPE) followed by gas chromatographic mass spectrometry (GCMS)...
July 4, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28686945/trophic-transfer-of-134-cs-in-the-manila-clam-ruditapes-philippinarum
#18
Murat Belivermiş, Önder Kılıç, Narin Sezer, Gülşah Kalaycı, Marc Metian
Bioaccumulation of radiocaesium in many marine organisms occurs through complex trophic transfer mechanisms. The present study addresses the trophic transfer of (134)Cs in the widely distributed marine bivalve, the Manila clam Ruditapes philippinarum, by experimentally determining the assimilation efficiency (AE) and the specific role of food quality or diet on the AE in this marine invertebrate. Pulse-chase feeding experiments were carried out on this clam using the phytoplankton species Tetraselmis chuii, Phaeodactylum tricornutum and Isochrysis galbana...
July 4, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28686944/cuckoos-vs-top-predators-as-prime-bioindicators-of-biodiversity-in-disturbed-environments
#19
Federico Morelli, Timothy A Mousseau, Anders Pape Møller
We studied the abundance of the common cuckoo Cuculus canorus L. little cuckoo Cuculus poliocephalus L. and Asian cuckoo Cuculus saturatus L. and avian top predators as indicators of bird species richness (surrogate of biodiversity) in disturbed environments caused by radioactive contamination in Chernobyl, Ukraine and Fukushima, Japan, comparing their efficiency as indicators of local biodiversity hotspots. Bird species richness and birds abundance were quantified in each sample site during the breeding seasons between 2006 and 2015 and the level of background radiation was measured at every site...
July 4, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28686943/determination-of-plutonium-isotopes-238-239-240-pu-and-strontium-90-sr-in-seafood-using-alpha-spectrometry-and-liquid-scintillation-spectrometry
#20
Choonshik Shin, Hoon Choi, Hye-Min Kwon, Hye-Jin Jo, Hye-Jeong Kim, Hae-Jung Yoon, Dong-Sul Kim, Gil-Jin Kang
The present study was carried out to survey the levels of plutonium isotopes ((238)(,)(239)(,)(240)Pu) and strontium ((90)Sr) in domestic seafood in Korea. In current, regulatory authorities have analyzed radionuclides, such as (134)Cs, (137)Cs and (131)I, in domestic and imported food. However, people are concerned about contamination of other radionuclides, such as plutonium and strontium, in food. Furthermore, people who live in Korea have much concern about safety of seafood. Accordingly, in this study, we have investigated the activity concentrations of plutonium and strontium in seafood...
July 4, 2017: Journal of Environmental Radioactivity
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