Results 151 to 160 of about 1,206 (184)
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Formation Rate of Nonexchangeable Organically Bound Tritium from Tritiated Soil Water
Health Physics, 1991The 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
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Experience acquired on environmental sample combustion for organically bound tritium measurement
Applied Radiation and Isotopes, 2009In 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 +2 more
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Interlaboratory Comparison of Organically Bound Tritium Measurements in Environmental Samples
Fusion Science and Technology, 2005The 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 +2 more
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Journal of Environmental Radioactivity, 1997
The uptake, loss, conversion and translocation of tritium in wheat plants were determined following a unique short-time exposure to atmospheric tritium under laboratory conditions. Potted plants were exposed between anthesis and maturity, under day-time conditions at two different light intensities and during night conditions.
Diabate, S., Strack, S.
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The uptake, loss, conversion and translocation of tritium in wheat plants were determined following a unique short-time exposure to atmospheric tritium under laboratory conditions. Potted plants were exposed between anthesis and maturity, under day-time conditions at two different light intensities and during night conditions.
Diabate, S., Strack, S.
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Method for organically bound tritium analysis from sediment using a combustion bomb
Applied Radiation and Isotopes, 2016The 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 +5 more
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An improved method for Organic Bound Tritium (OBT) determination in urine samples
Radiation Protection Dosimetry, 2006The 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 +7 more
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Quantification of exchangeable and non-exchangeable organically bound tritium (OBT) in vegetation
Journal of Environmental Radioactivity, 2013The 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
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Doses from the consumption of Cardiff Bay flounder containing organically bound tritium
Journal of Radiological Protection, 2005ICRP dose coefficients for the ingestion of organically bound tritium (OBT) by adults and children are intended for general application to unspecified forms in diet and may not be applicable to intakes of a specific form of OBT. To obtain information relating to OBT in fish from Cardiff Bay, the retention of tritium in adult rats was determined after ...
A, Hodgson +3 more
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Doses and risks from tritiated water and environmental organically bound tritium
Journal of Radiological Protection, 2009This short review provides an explanation of the calculation and use of the ICRP protection quantities, equivalent and effective dose, including the simplifications introduced by using radiation and tissue weighting factors. It discusses the dose coefficients (Sv Bq(-1) intake) provided by ICRP for intakes of tritiated water (HTO) and organically bound
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Homogeneity assessment for grass samples used for organically bound tritium proficiency test
Applied Radiation and Isotopes, 2018The paper presents homogeneity check for dried grass batch to be used in an inter-comparison exercise. When carrying out an inter-comparison exercise, the organizer must guarantee that the unsatisfactory result will not be imputed to the sample and sample's changeability. Therefore, in an inter-comparison exercise must carry on the homogeneity testing.
Carmen, Varlam +5 more
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