Determination of picogram amounts of technetium in environmental samples by neutron activation analysis

Foti, S.; Delucchi, E.; Akamian, V.

doi:10.1016/s0003-2670(01)95002-0

Cited by 38 publications

(11 citation statements)

References 5 publications

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“…The use of ammonia, to prevent volatilization of technetium, was first proposed by Foti et al (1972), and its use is thought to ensure that all free acidic sites, on the complex organic molecules present, are neutralized, thus decreasing the opportunity for the volatile acids HTcO 4 or HReO 4 to form. Table 2 illustrates the effect of ashing materials containing technetium and rhenium under various conditions.…”

Section: The Form Of 99mentioning

confidence: 99%

Determination of technetium-99 in environmental material with rhenium as a yield monitor

Harvey

Williams

Lovett

et al. 1992

Journal of Radioanalytical and Nuclear Chemistry, Articles

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Section: The Form Of 99mentioning

confidence: 99%

Determination of technetium-99 in environmental material with rhenium as a yield monitor

Harvey

Williams

Lovett

et al. 1992

Journal of Radioanalytical and Nuclear Chemistry, Articles

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“…(9). Their quoted recoveries were 80% and the detection liniit for vegetation varied from 9 X lo-" to…”

Section: Resultsmentioning

confidence: 96%

The determination of technetium-99 in urine

Kramer¹

1983

Can. J. Chem.

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. Can. J. Chem. 61, 1949Chem. 61, (1983. A method has bcen developed for the routine radiochemical analysis of technetium-99 in human urinc. Thc excretcd technetium is coprecipitated from a 200 mL urine sample with CuS. Valcncc state adjustments are performed with K,SZOx. The precipitatc is dissolved in ammoniacal pcroxide and, after the Cu(ll) is removed by ion exchange, the Tc-99 is cxtractcd with 2-butanone (MEK). Subsequent evaporation of the organic solvent gives an csscntially wcightlcss source that if counted with a gas proportional counter will give a better limit of detection than liquid scintillation methods. The recovery of Tc-99 using this procedure is 80% ( u = 4%) and the limit of detection is 20 mBq (0.6 pCi) at the 95% confidence level for a routinc sample -counting time 20 minutes, counting cfficicncy 24%, ambient background 1.3 counts per minute (cpm).GARY H. KRAMER. Can. J. Chem. 61, 1949Chem. 61, (1983 On a mis au point une methode d'analyse radiochimique courante du teehnttium-99 dans I'urine humaine. A partir d'un Cchantillon de 200 mL d'urine, on fait coprtcipiter le technetium excrCtC avec du CuS. On rCalise des ajustements de la valence avec du K2S208 On dissout le prCcipit6 dans du peroxyde ammoniacal et on extrait le Tc-99 avec la butanone-2 (MEK) aprks avolr enlev6 le Cu(I1) par Ccl~ange d'ions. L'Cvaporation subsequente du solvant organique donne essentiellement une source imponderable qui si elle est comptCe avec un compteur proportionnelle de gaz donnera une meilleure lim~te de detection que les mCthodes de scintillation liquide. Par cette methode on rkcupkre le Tc-99 h 80% ( u = 4%) et la limite de detection est de 20 mBq (0,6 pCi) avec une certitude de 95% pour un eehantillon courant. LC temps de comptage est dc 20 minutes, I'efficacite de comptage est de 24%, le bruit de fond est de 1.3 compte par minute (cpm).[Traduit par le journal]

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“…Since the stable isotopes 99 Ru, 98 Ru, 100 Ru, 98 Mo, and 100 Mo are the main interferences in the mass spectrometric determination of 99 99 Tc has to be separated from the sample prior to irradiation; in addition a fast sample transfer system has to be used to shorten the decay time. NAA is theoretically a more sensitive method for 99 Tc, and a detection limit of 2.5 mBq has been obtained using pre-separation and radiochemical NAA [199][200]. Compared with 100 Tc, 99m…”

Section: Technitium-99mentioning

confidence: 99%

Critical comparison of radiometric and mass spectrometric methods for the determination of radionuclides in environmental, biological and nuclear waste samples

Hou

Roos

2008

Analytica Chimica Acta

342

253

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Determination of picogram amounts of technetium in environmental samples by neutron activation analysis

Cited by 38 publications

References 5 publications

Determination of technetium-99 in environmental material with rhenium as a yield monitor

Determination of technetium-99 in environmental material with rhenium as a yield monitor

The determination of technetium-99 in urine

Critical comparison of radiometric and mass spectrometric methods for the determination of radionuclides in environmental, biological and nuclear waste samples

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