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Poster De Conférence Année : 2023

Development of a method to quantify Pd-107 in radioactive wastes

Marina Faure
Celine Gautier
Pascal Fichet
  • Fonction : Auteur
Christèle Colin
Elodie Laporte

Résumé

With a half-life of 6.500.000 years, Pd-107 has the longest period among the radioactive isotopes of palladium. This radionuclide results from the fission of U-235 and needs to be taken into account for the management of radioactive waste in France, especially regarding its contribution to radioactivity for a safe long-term storage. The French National Radioactive Waste Management Agency (ANDRA) requests its declaration above 10- 4 Bq/g and waste containing more than 3x105 Bq/g cannot be handled as "low and intermediate level radwaste" anymore [1]. Considering the increase of decommissioning and dismantling activities of nuclear sites, Pd-107 quantification with good accuracy is a significant challenge. Besides, as Pd is a rare and expensive metal also used in organic chemistry and in automotive industry [2], an efficient extraction method could bring additional information to improve its recycling in other fields. Therefore, developing an accurate method to extract and quantify Pd-107 in nuclear waste is of high interest [3]. As a beta emitter, Pd-107 has to be isolated from interfering radionuclides through a radiochemical procedure prior to any measurement by liquid scintillation counting or ICP-MS. Few methods for Pd-107 quantification in radwaste already exist [4]. However, they often use chemical reagents affected by REACH restrictions or non-commercial extracting agents, which needs to be synthetized by organic chemistry. Moreover, these methods use liquid-liquid extractions, which expose the operator to radiations and potential contaminations. Besides, most studies performed to separate Pd from the other platinum group elements are conducted without taking into account common analytes encountered in radioactive waste such as 137Cs, 60Co, 55Fe, 63Ni or mass-interfering elements like Ag or Zr. The aim of this presentation is to investigate the selectivity of common precipitation steps in order to isolate Pd-107 in radwaste containing interfering elements. Precipitations with ammonia or with sodium hydroxide of a solution containing 29 elements including Pd are performed. The resulting samples, in particular the supernatants, are analysed by ICP-AES. This first investigation provides information on Pd behaviour in these different conditions, on the efficiency of each precipitation method and will highlight the elements recovered with Pd. The optimization of the radiochemical method also includes separations on Ni-resin® to fully purify Pd.

Domaines

Radiochimie
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Dates et versions

cea-04396816 , version 1 (16-01-2024)

Identifiants

  • HAL Id : cea-04396816 , version 1

Citer

Marina Faure, Celine Gautier, Pascal Fichet, Isabelle Billard, Christèle Colin, et al.. Development of a method to quantify Pd-107 in radioactive wastes. 3rd International Conference on Radioanalytical and Nuclear Chemistry, May 2023, Budapest, Hungary. 2023. ⟨cea-04396816⟩
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