Measurement of 99Tc in Savannah River Site high activity waste

DiPrete, D. P.; DiPrete, C. C.; Sigg, R.A.

doi:10.1007/s10967-005-0629-5

Cited by 12 publications

(8 citation statements)

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“…The strongly acidic high-level liquid wastes and super alkaline tank wastes stored at Hanford and Savannah River Sites represent a significant obstacle to the design of adsorbents for 99 TcO 4 − capture. 16,17 Our results revealed that iCOP-2 showed relatively high ReO 4…”

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confidence: 67%

Modulating Anion Nanotraps via Halogenation for High-Efficiency ⁹⁹TcO₄^–/ReO₄^– Removal under Wide-Ranging pH Conditions

Yang

Hao

et al. 2023

Environ. Sci. Technol.

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Efficient and sustainable methods for 99 TcO 4 − removal from acidic nuclear waste streams, contaminated water, and highly alkaline tank wastes are highly sought after. Herein, we demonstrate that ionic covalent organic polymers (iCOPs) possessing imidazolium-N + nanotraps allow the selective adsorption of 99 TcO 4 − under wide-ranging pH conditions. In particular, we show that the binding affinity of the cationic nanotraps toward 99 TcO 4 − can be modulated by tuning the local environment around the nanotraps through a halogenation strategy, thereby enabling universal pH 99 TcO 4 − removal. A parent iCOP-1 possessing imidazolium-N + nanotraps showed fast kinetics (reaching adsorption equilibrium in 1 min), a high adsorption capacity (up to 1434.1 ± 24.6 mg/g), and exceptional selectivity for 99 TcO 4 − and ReO 4 − (nonradioactive analogue of 99 TcO 4 − ) removal in contaminated water. By introducing F groups near the imidazolium-N + nanotrap sites (iCOP-2), a ReO 4 − removal efficiency over 58% was achieved in 60 min in 3 M HNO 3 solution. Further, introduction of larger Br groups near the imidazolium-N + binding sites (iCOP-3) imparted a pronounced steric effect, resulting in exceptional adsorption performance for 99 TcO 4 − under super alkaline conditions and from lowactivity waste streams at US legacy Hanford nuclear sites. The halogenation strategy reported herein guides the task-specific design of functional adsorbents for 99 TcO 4 − removal and other applications.

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confidence: 67%

Modulating Anion Nanotraps via Halogenation for High-Efficiency ⁹⁹TcO₄^–/ReO₄^– Removal under Wide-Ranging pH Conditions

Yang

Hao

et al. 2023

Environ. Sci. Technol.

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“…Furthermore, since functional groups are in a liquid form, rather than fixed to a polymer backbone these groups have greater flexibility to coordinate around target anions. This means that the uptake of these ions is generally higher and often at lower acid concentrations. , By conditioning the resin with nitric acid, the nitrate is linked to the quaternary amine and acts as counterion for the anionic interchange with the pertechnetate. The high retention of Tc(VII) by the TEVA resin at low acidity is due to the high selectivity of the quaternary ammonium salts for the pertechnetate anion over the anion of the acid …”

Section: Resultsmentioning

confidence: 99%

Automatic and Simple Method for ⁹⁹Tc Determination Using a Selective Resin and Liquid Scintillation Detection Applied to Urine Samples

et al. 2013

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(99m)Tc (6.0067 h half-life) is an artificial radionuclide largely used in diagnostic medicine. Its daughter (99)Tc is a beta emitter of great concern because of its long half-life (2.111 × 10(5) years) and presumed mobile behavior in the environment. To monitor the (99)Tc in urine from treated patients, an automatic Lab-on-valve (LOV) system for separation and preconcentration of (99)Tc was developed. TEVA resin was selected since it retains pertechnetate ion selectively from diluted nitric acid solutions. After elution, (99)Tc is detected using a liquid scintillation counting (LSC) detector. The present method has been successfully applied to urine samples with low (99)Tc content (recoveries between 94-111%). The minimum detectable activity (MDA) of the developed method is 0.1 Bq or 1 Bq L(-1) (expressed as activity concentration), when preconcentrating 100 mL of sample. The high durability of the resin, together with the low amount of resin required (32 mg), the good reproducibility (RSD 2%, n = 5) and the high extraction frequency (up to 12 h(-1)) makes of the present method an inexpensive, precise and fast useful tool for monitoring (99)Tc in urine samples.

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“…Figure 2a, 2b, and 2c shows sensitivities 2 for NAA at the SRNL NAA facility using routine activation and counting protocols; the figure assumes that activation and counting times individually are the lesser of two half lives or two days. Most routine analyses, however, receive 6 relatively short exposures and counts while meeting analytical goals. Since counting backgrounds for NAA are matrix dependent due to activation of other species in the matrix, the sensitivities shown are for bounding-case matrices that offer few if any interferences.…”

Section: Resultsmentioning

confidence: 99%

Neutron activation analysis applications at the Savannah River Site using an isotopic neutron source

DiPrete

Sigg

2008

J Radioanal Nucl Chem

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NAA using 252 Cf is used to address important areas of applied interest at SRS.Sensitivity needs for many of the applications are not severe; analyses are accomplished using a 21 mg 252 Cf NAA facility. Because NAA allows analysis of bulk samples, it offers strong advantages for samples in difficult-to-digest matrices when its sensitivity is sufficient. Following radiochemical separation with stable carrier addition, chemical yields for a number methods are determined by neutron activation of the stable carrier. In some of the cases where no suitable stable carriers exist, the source has been used to generate radioactive tracers to yield separations.

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Measurement of 99Tc in Savannah River Site high activity waste

Cited by 12 publications

References 1 publication

Modulating Anion Nanotraps via Halogenation for High-Efficiency ⁹⁹TcO₄^–/ReO₄^– Removal under Wide-Ranging pH Conditions

Modulating Anion Nanotraps via Halogenation for High-Efficiency ⁹⁹TcO₄^–/ReO₄^– Removal under Wide-Ranging pH Conditions

Automatic and Simple Method for ⁹⁹Tc Determination Using a Selective Resin and Liquid Scintillation Detection Applied to Urine Samples

Neutron activation analysis applications at the Savannah River Site using an isotopic neutron source

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Measurement of 99Tc in Savannah River Site high activity waste

Cited by 12 publications

References 1 publication

Modulating Anion Nanotraps via Halogenation for High-Efficiency 99TcO4–/ReO4– Removal under Wide-Ranging pH Conditions

Modulating Anion Nanotraps via Halogenation for High-Efficiency 99TcO4–/ReO4– Removal under Wide-Ranging pH Conditions

Automatic and Simple Method for 99Tc Determination Using a Selective Resin and Liquid Scintillation Detection Applied to Urine Samples

Neutron activation analysis applications at the Savannah River Site using an isotopic neutron source

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Modulating Anion Nanotraps via Halogenation for High-Efficiency ⁹⁹TcO₄^–/ReO₄^– Removal under Wide-Ranging pH Conditions

Modulating Anion Nanotraps via Halogenation for High-Efficiency ⁹⁹TcO₄^–/ReO₄^– Removal under Wide-Ranging pH Conditions

Automatic and Simple Method for ⁹⁹Tc Determination Using a Selective Resin and Liquid Scintillation Detection Applied to Urine Samples