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Pediatric Terrorism and Disaster Preparedness: A ... - PHE Home

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exposure dose is associated with a parallel increase in both the constellation of prodromal<br />

signs <strong>and</strong> symptoms <strong>and</strong> the percentage of exposed individuals affected. For example,<br />

only 50% of individuals exposed to 2-Gy acute photon radiation will exhibit emesis.<br />

Radiation doses above 2 Gy will result in a progressive increase in the percentage of<br />

individuals who vomit <strong>and</strong> also express the broad range of prodromal symptoms.<br />

Hematology. Radiation exposure produces a predictable pattern of changes in bloodforming<br />

tissues. A crude estimate of absorbed dose can be obtained by serial<br />

measurement of peripheral lymphocyte blood counts. Therefore, a CBC with WBC<br />

differential should be obtained immediately after exposure, three times a day for the next<br />

2–3 days, <strong>and</strong> then twice a day for the next 3–6 days. Lymphocyte cell counts <strong>and</strong><br />

lymphocyte depletion kinetics can be used to estimate exposures between 1 <strong>and</strong> 10 Gy<br />

photon equivalent dose range. This biodosimeter is useful only for a few days (

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