Results 101 to 110 of about 165 (144)

Organically Bound Tritium

Health Physics, 1993
Tritium released into the environment may be incorporated into organic matter. Organically bound tritium in that case will show retention times in organisms that are considerably longer than those of tritiated water which has significant consequences on dose estimates.
Diabate, S., Strack, S.
openaire   +2 more sources

Enhanced activities of organically bound tritium in biota samples

Applied Radiation and Isotopes, 2014
A pilot study aimed on possible occurrence of elevated activity of non-exchangable organically bound tritium (NE-OBT) in biota was performed. The first results showed a significant surplus of NE-OBT activity in biota of the valley of Mohelno reservoir and Jihlava river.
I, Svetlik, M, Fejgl, I, Malátová, L, Tomaskova   +3 more
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Metabolism of Organically Bound Tritium in Man

Radiation Research, 1984
The classic methodology for estimating dose to man from environmental tritium assumes that all tritium, whether organically bound or free, enters directly into man's free body water compartment and is uniformly distributed as tritiated water. This methodology ignores the fact that organically bound tritium in foodstuffs may be directly assimilated in ...
E L, Etnier, C C, Travis, D M, Hetrick
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THEORETICAL ORGANICALLY BOUND TRITIUM DOSE ESTIMATES

Health Physics, 2004
This paper illustrates a theoretical approach to estimating the dose associated with the ingestion of both organically bound tritium and tissue free water tritium relative to the ingestion of only tissue free water tritium. Organically bound tritium, specifically non-exchangeable OBT, can result in an increased dose relative to that from exchangeable ...
T A, DeVol, B A, Powell
openaire   +2 more sources

Organically bound tritium level in vegetation at ICIT tritium removal facility

Journal of Radioanalytical and Nuclear Chemistry, 2014
In order to evaluate the impact of tritium on wild vegetation around ICIT we have monitored the tritium concentrations in precipitation, air, soil, grass and green wheat from a specific area near the tritium removal facility during vegetation periods in 2012–2013.
Irina Vagner, Carmen Varlam, Ionut Faurescu, Denisa Faurescu   +3 more
openaire   +1 more source

Organically Bound Tritium Analysis in Environmental Samples

Fusion Science and Technology, 2015
Many methods allow analysing the various forms of tritium in environmental samples; however, there are no published standard methods for measuring organically bound tritium (OBT). Furthermore, there are no certified reference materials of OBT for environmental samples.
Baglan, N., Kim, S.B., Cossonnet, C., Croudace, I.W., Fournier, M., Galeriu, D., Warwick, P.E., Momoshima, N., Ansoborlo, E.   +8 more
openaire   +2 more sources

The human body retention time of environmental organically bound tritium

Journal of Radiological Protection, 2009
Tritium in the UK environment causes low radiation doses to the public, but uncertainty exists in the dose coefficient for the organically bound component of tritium (OBT). This can affect the assessment of effective doses to representative persons. Contributing to that uncertainty is poor knowledge of the body retention time of OBT and how this varies
John, Hunt, Trevor, Bailey, Allan, Reese
openaire   +2 more sources

Uptake of Tritium in the Organically Bound Form into the Biomass of the Soil

Fusion Technology, 1988
Laboratory experiments and field observations have shown that elemental tritium HT is completely converted into tritiated water (HTO) by the activity of soil microorganisms. No organically bound tritium (OBT) is formed initially, but some tritium is taken up into soil biomass by general biosynthesis.
H. Förstel, H. Papke, I. Hillmann
openaire   +1 more source

Non-exchangeable organically bound tritium (OBT): its real nature

Analytical and Bioanalytical Chemistry, 2004
Denaturation experiments show that the larger part of organically bound tritium (OBT) consists of "buried tritium" and is not bound to carbon, as has been traditionally assumed. The logistical growth analysis of hydrogen isotopes in dry plant matter reveals a larger rate of increase of OBT than organically bound hydrogen (OBH).
F, Baumgärtner, W, Donhaerl
openaire   +2 more sources

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
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