دانلود رایگان مقاله لاتین تحلیل تریتیوم از سایت الزویر
عنوان فارسی مقاله:
روشی برای تجزیه و تحلیل تریتیوم ارگانیک بدون رسوب با استفاده از بمب احتراق
عنوان انگلیسی مقاله:
Method for organically bound tritium analysis from sediment using a combustion bomb
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Tritium and radiocarbon are currently the two main radionuclides that might be discharged in water bodies by the industry and particularly by heavy-water reactors, such as CANDU reactors. Tritium widely integrates into the water cycle and follows the water mass dynamics but it may also be integrated for long term into the organic pool, persisting in aquatic environment according to the recycling rates of organic matter (Eyrolle-Boyer et al., 2015). The experimental data indicated a time lag between concentrations of tritium in water and sediments, reflecting non-equilibrium attributed to the specific dynamics of tissue free water tritium (TFWT as HTO) and organically bound tritium (OBT) forms: TFWT follows the transfer of water while OBT depends on process linked to organic matter (biomass production, degradation and recycling). Tritium persistence through its OBT forms in biomass and aquatic systems may have a major impact on environmental compartments submitted to chronic releases (Eyrolle-Boyer et al., 2014), due to its significant radiotoxicity and contribution to the total dose (Galeriu et. al., 2010; UNSCEAR, 2000). Current measurement of organically bound tritium (OBT) from sediment using liquid scintillation counting (LSC) implies first of all conversion of organic matter in liquid water. In order to convert sediment organic matter to water it is necessary to perform a total oxidation process, which most commonly can be made through wet oxidation (Ware and Allot, 1999; Environment Agency, 2005) or combustion using different type of catalytic furnaces (Cossonnet et. al., 2009; Daillant et. al., 2004; Eyrolle-Boyer et al., 2014; Fournier et. al. 2002; Morris, 2006; Vichot et. al. 2005,) or the devices called oxidizers (Kim et. al., 2013). The objective of this study was to develop, optimize and verify a new method for analysis of OBT from sediments, using a Parr bomb type 1121. This kind of apparatus, already available in our laboratory, is considered a versatile device needing limited financial resources and also the duration of the combustion process is significantly shorter compared with the other kind of combustion devices. The content of carbon and hydrogen in sediments are usually quite low, around 3% for carbon and 1% or less for hydrogen, and the combustion of the organic matter using a Parr bomb has limitations. In order to use this kind of device for sediment combustion we needed to mix the sample with a tritium free combustion promoter.
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کلمات کلیدی:
[PDF]Measurement of Organic Bound Tritium (OBT) in urine samples ... - IAEA www.iaea.org/inis/collection/NCLCollectionStore/_Public/35/066/35066107.pdf by R Gonen - Related articles Exposures to tritiated water (HTO), organically bound tritium (OBT), and tritium gas ... method is the more suitable and includes oxidation of hydrogenous ... [PDF]Method for organically bound tritium analysis from sediment using a ... iranarze.ir/wp-content/uploads/2016/10/E270.pdf Sep 9, 2016 - Keywords: Sediments. Organically bound tritium. Parr bomb. Liquid scintillation counting. A B S T R A C T. The method consisted in combustion ... [PDF]LOW LEVEL ORGANICALLY BOUND TRITIUM MEASUREMENTS IN ... www.lanl.gov/BAER-Conference/BAERCon-42p036a.pdf method has been used to measure tritium concentrations as low as 0.04 Bq L-1 in ... An organically bound tritium (OBT) measurement study, comparing the ... Organically Bound Tritium Analysis in Environmental Samples: Fusion ... www.tandfonline.com/doi/abs/10.13182/FST14-T3 by N Baglan - 2015 - Cited by 6 - Related articles Mar 23, 2017 - Many methods allow analysing the various forms of tritium in environmental samples; however, there are no published standard methods for ... Organically bound tritium \(OBT\) - Radioprotection www.radioprotection.org/articles/radiopro/pdf/2013/01/radiopro120067.pdf OBT (Organically Bound Tritium) determination, transfer and behaviour in the .... changes in the fuel management methods used by Nuclear Power Plants ... Tritium and the environment - IRSN www.irsn.fr › ... › Research › Publications and documentation › Radionuclides sheets Aug 9, 2012 - Organically Bound Tritium (OBT): this form, in which tritium is bound to .... This method applies to free tritium and to organically bound tritium. improved method for Organic Bound Tritium (OBT) determination in ... https://academic.oup.com/.../An-improved-method-for-Organic-Bound-Tritium-OBT Aug 31, 2007 - Abstract. The Organic Bound Tritium (OBT) amount in the body may induce changes in the evaluation of the internal exposure to tritium, due to ...
