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Delayed chelation therapy using calcium-DTPA (diethylenetriaminepentaacetic acid) effectively treated plutonium inhalation by chelating intracellular plutonium. This study validates a chelation model for analyzing bioassay data in such cases.

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Area of Science:

  • Radiological Protection
  • Biokinetics
  • Chelation Therapy

Background:

  • A case study involving a worker with plutonium-238 inhalation received delayed chelation therapy.
  • Treatment involved intravenous injections and nebulizations of calcium-DTPA (Ca-DTPA) over four years, starting months after the suspected inhalation.
  • Previous analyses focused on the case without explicitly modeling the plutonium-DTPA chelate biokinetics.

Purpose of the Study:

  • To analyze bioassay data from a plutonium inhalation case using a previously established chelation model.
  • To explicitly model the combined biokinetics of the plutonium-DTPA chelate.
  • To support the hypothesis that delayed chelation's efficacy stems from intracellular chelation.

Main Methods:

  • Utilized a previously established chelation model to analyze bioassay data (urine and fecal samples).
  • Optimized parameters including intake magnitude and timing, plutonium solubility, and absorbed fraction of nebulized Ca-DTPA.
  • Modeled the combined biokinetics of plutonium and the Ca-DTPA chelate.

Main Results:

  • The chelation model successfully fitted the bioassay data by optimizing key parameters.
  • The analysis supports the hypothesis that intracellular chelation by Ca-DTPA is the primary mechanism for delayed chelation efficacy.
  • Demonstrated the validity and applicability of the established chelation model for analyzing such cases.

Conclusions:

  • Delayed chelation therapy, particularly intracellular chelation, is effective in managing plutonium internal contamination.
  • The established chelation model is a valid tool for assessing the efficacy of chelation therapy in real-world exposure scenarios.
  • While anonymized data prevented exact dose calculation, treatment-induced dose inhibition was determined.