Citation

Wilkins RC, Romm H, Kao TC, Awa AA, Yoshida MA, Livingston GK, Jenkins MS, Oestreicher U, Pellmar TC, Prasanna PGS. Radiat. Res. 2008; 169(5): 551-560.

Affiliation

Health Canada, Consumer and Clinical Radiation Protection Bureau, Ottawa, Canada.

Copyright

(Copyright © 2008, BioOne)

DOI

10.1667/RR1272.1

PMID

18439045

Abstract

This interlaboratory comparison validates the dicentric chromosome assay for assessing radiation dose in mass casualty accidents and identifies the advantages and limitations of an international biodosimetry network. The assay's validity and accuracy were determined among five laboratories following the International Organization for Standardization guidelines. Blood samples irradiated at the Armed Forces Radiobiology Research Institute were shipped to all laboratories, which constructed individual radiation calibration curves and assessed the dose to dose-blinded samples. Each laboratory constructed a dose-effect calibration curve for the yield of dicentrics for (60)Co gamma rays in the 0 to 5-Gy range, using the maximum likelihood linear-quadratic model, Y = c + alphaD + betaD(2). For all laboratories, the estimated coefficients of the fitted curves were within the 99.7% confidence intervals (CIs), but the observed dicentric yields differed. When each laboratory assessed radiation doses to four dose-blinded blood samples by comparing the observed dicentric yield with the laboratory's own calibration curve, the estimates were accurate in all laboratories at all doses. For all laboratories, actual doses were within the 99.75% CI for the assessed dose. Across the dose range, the error in the estimated doses, compared to the physical doses, ranged from 15% underestimation to 15% overestimation.

Language: en