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Determination of {sup 131}I and thorium in urine; Determinacao de iodo-131 e torio em urina

Thesis/Dissertation:

Abstract

Methods for the determination of {sup 131}I and Thorium in urine have been developed taking into account the monitoring needs for people who handle with these radioisotopes. The method for determining {sup 131}I is based in the use of silver chloride to separate iodine by precipitation from the sample; the detection was carried out in a Nal (Tl) well type scintillator connected to a single channel analyser. This method has the following advantages; it is easy and relatively fast as well as selective, showing a separation yield higher than 80%. Thorium in urine was determined by colorimetry after the mineralization of the sample using nitric acid, and sulphuric acid, and then oxygen peroxide. The chromophore reagent used was Thoron (disodium salt of 2-(2-hydroxy-3,6-disulfo-l-naphthylazo) benzenearsonic acid).The absorbance was measured in a spectro colorimeter at a fixed wavelength (530 nm). The method proved to be simple allowing a separation yield of about 80%. The most representative sample for a monitoring program in a {sup 131}I production laboratory has been established. The {sup 131}I concentration in urine of individuals with chronic contamination have also been measured; an interpretation of these results is discussed. (author)
Publication Date:
Jul 01, 1978
Product Type:
Thesis/Dissertation
Report Number:
INIS-BR-6993
Resource Relation:
Other Information: TH: Diss. (M.Sc.)
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ABSORPTION SPECTROSCOPY; CHEMICAL REACTION YIELD; IODINE 131; NAI DETECTORS; SAMPLE PREPARATION; THORIUM; URINE
OSTI ID:
21325974
Research Organizations:
Instituto de Energia Atomica (IEA), Sao Paulo, SP (Brazil)
Country of Origin:
Brazil
Language:
Portuguese
Other Identifying Numbers:
TRN: BR10V1498067319
Availability:
Available from INIS in electronic form
Submitting Site:
BRN
Size:
81 pages
Announcement Date:
Aug 26, 2010

Thesis/Dissertation:

Citation Formats

Tomida, Rute Miwa. Determination of {sup 131}I and thorium in urine; Determinacao de iodo-131 e torio em urina. Brazil: N. p., 1978. Web.
Tomida, Rute Miwa. Determination of {sup 131}I and thorium in urine; Determinacao de iodo-131 e torio em urina. Brazil.
Tomida, Rute Miwa. 1978. "Determination of {sup 131}I and thorium in urine; Determinacao de iodo-131 e torio em urina." Brazil.
@misc{etde_21325974,
title = {Determination of {sup 131}I and thorium in urine; Determinacao de iodo-131 e torio em urina}
author = {Tomida, Rute Miwa}
abstractNote = {Methods for the determination of {sup 131}I and Thorium in urine have been developed taking into account the monitoring needs for people who handle with these radioisotopes. The method for determining {sup 131}I is based in the use of silver chloride to separate iodine by precipitation from the sample; the detection was carried out in a Nal (Tl) well type scintillator connected to a single channel analyser. This method has the following advantages; it is easy and relatively fast as well as selective, showing a separation yield higher than 80%. Thorium in urine was determined by colorimetry after the mineralization of the sample using nitric acid, and sulphuric acid, and then oxygen peroxide. The chromophore reagent used was Thoron (disodium salt of 2-(2-hydroxy-3,6-disulfo-l-naphthylazo) benzenearsonic acid).The absorbance was measured in a spectro colorimeter at a fixed wavelength (530 nm). The method proved to be simple allowing a separation yield of about 80%. The most representative sample for a monitoring program in a {sup 131}I production laboratory has been established. The {sup 131}I concentration in urine of individuals with chronic contamination have also been measured; an interpretation of these results is discussed. (author)}
place = {Brazil}
year = {1978}
month = {Jul}
}