Quickscan dicentric chromosome analysis for radiation biodosimetry

Area of Science:

• Cytogenetics
• Radiation Biology
• Biodosimetry

Background:

• The dicentric chromosome assay (DCA) is the gold standard for estimating radiation doses after accidents.
• Conventional DCA is time-consuming and requires specialized expertise, limiting its use in mass-casualty events.
• Faster, high-throughput biodosimetry is needed for effective triage in radiological emergencies.

Purpose of the Study:

• To evaluate DCA QuickScan as a rapid alternative for triage-quality biological dosimetry.
• To compare the accuracy and speed of DCA QuickScan against the conventional DCA.

Main Methods:

• Triage-quality conventional DCA and DCA QuickScan were performed by 9-15 scorers across four laboratories.
• Analysis involved scoring a minimum of 50 metaphase cells or 30 dicentrics for each method.
• Dose estimates were compared to actual doses for unknown samples.

Main Results:

• Conventional DCA dose estimates were within 0.5 Gy of the actual dose for 83% of samples.
• DCA QuickScan dose estimates were within 0.5 Gy of the actual dose for 80% of samples.
• Most discrepancies were dose over-estimates, with DCA QuickScan showing comparable accuracy to conventional DCA.

Conclusions:

• DCA QuickScan provides critical dose information significantly faster than conventional DCA.
• The DCA QuickScan approach maintains accuracy, making it suitable for rapid triage in mass-casualty radiological incidents.
• Further studies are warranted to fully validate the DCA QuickScan method's accuracy.