Results 111 to 120 of about 166 (144)

Experience acquired on environmental sample combustion for organically bound tritium measurement

Applied Radiation and Isotopes, 2009
In order to determine organically bound tritium (OBT) concentrations, environmental samples are generally first freeze-dried. This first step is to remove tritiated water. Then, the dry residue is burnt in a special furnace with oxygen. Finally, the tritiated water fraction obtained is measured using a liquid scintillation counter.
C, Cossonnet, A M, Neiva Marques, R, Gurriaran   +2 more
openaire   +2 more sources

An improved method for Organic Bound Tritium (OBT) determination in urine samples

Radiation Protection Dosimetry, 2006
The Organic Bound Tritium (OBT) amount in the body may induce changes in the evaluation of the internal exposure to tritium, due to its different retention time relative to HTO. OBT measurements for urine are not performed routinely, mainly because of the lengthy work needed in preparation of the samples, when using the standard oxygen combustion ...
R, Gonen, R, Marco, U, German, E, Katorza, Z B, Alfassi, G, Haquin, A, Tshuva, O, Pelled   +7 more
openaire   +2 more sources

Quantification of exchangeable and non-exchangeable organically bound tritium (OBT) in vegetation

Journal of Environmental Radioactivity, 2013
The objective of this study is to quantify the relative amounts of exchangeable organically bound tritium (OBT) and non-exchangeable OBT in various vegetables. A garden plot at Perch Lake, where tritium levels are slightly elevated due to releases of tritium from a nearby nuclear waste management area and Chalk River Laboratories (CRL) operations, was ...
S B, Kim, V, Korolevych
openaire   +2 more sources

Canadian inter-laboratory organically bound tritium (OBT) analysis exercise

Journal of Environmental Radioactivity, 2015
Tritium emissions are one of the main concerns with regard to CANDU reactors and Canadian nuclear facilities. After the Fukushima accident, the Canadian Nuclear Regulatory Commission suggested that models used in risk assessment of Canadian nuclear facilities be firmly based on measured data.
S B, Kim, J, Olfert, N, Baglan, N, St-Amant, B, Carter, I, Clark, C, Bucur   +6 more
openaire   +2 more sources

Simplified and sensitive analysis of organically bound tritium in tree rings to retrospect environmental tritium levels

Applied Radiation and Isotopes, 1995
Abstract In order to estimate the environmental tritium level retrospectively, the authors tried to establish a simplified and sensitive method for determination of organically bound tritium in tree rings. Organically bound tritium as low as approx. 1 Bq L−1 was determined with sufficient reproducibility, after combusting 25 g of dried wood without ...
Shoichi Fuma, Yoshikazu Inoue
openaire   +1 more source

Interlaboratory Comparison of Organically Bound Tritium Measurements in Environmental Samples

Fusion Science and Technology, 2005
The measurement of organically bound tritium in environmental samples is essential for assessing the impact of tritium releases in terms of doses to the general public and a growing number of laboratories are now required to make them. Interlaboratory comparisons provide one way for laboratories to practice and check their analytical methods and ...
W. J. G. Workman, S. B. Kim, T. G. Kotzer   +2 more
openaire   +1 more source

Distribution of the Organically Bound Tritium in Vegetation Exposed to Fall-out

Radiation Protection Dosimetry, 1986
Abstract Measurements have been made of tissue free water tritium (TFWT) and organically bound tritium (OBT) in plant samples taken from areas that were presumably exposed to fall-out only. Tritium was determined from large samples to obtain sufficiently accurate measurements.
Y. Belot, C. Caput, D. Gauthier
openaire   +1 more source

Formation Rate of Nonexchangeable Organically Bound Tritium from Tritiated Soil Water

Health Physics, 1991
The role of soil microorganisms in the formation of nonexchangeable organically bound tritium (OBT) from tritiated water (HTO) is investigated. Incubation experiments were conducted with five different soils. They were found to build up OBT at a rate of 0.03-0.05% per week.
H, Papke, H, Förstel
openaire   +2 more sources

Method for organically bound tritium analysis from sediment using a combustion bomb

Applied Radiation and Isotopes, 2016
The method consisted in combustion, using a Parr bomb type 1121, of a sediment - tritium free promoter mixture. The proper ratio sediment to promoter in our experiments was between 1:3 and 1:2, higher ratio resulting in unreliable results, due to incomplete combustion of the sample. The described method was used to measure the estuarine sediment sample
I, Vagner, C, Varlam, I, Faurescu, D, Faurescu, D, Bogdan, F, Bucura   +5 more
openaire   +2 more sources

Apparent enrichment of organically bound tritium in rivers explained by the heritage of our past

Journal of Environmental Radioactivity, 2014
The global inventory of naturally produced tritium (3H) is estimated at 2.65 kg, whereas more than 600 kg have been released during atmospheric nuclear tests (NCRP, 1979; UNSCEAR, 2000) constituting the main source of artificial tritium throughout the Anthropocene.
Frédérique, Eyrolle-Boyer, Patrick, Boyer, David, Claval, Sabine, Charmasson, Catherine, Cossonnet   +4 more
openaire   +2 more sources