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Chemical Agents of Opportunity for Terrorism: TICs & TIMs

Chemical Agents of Opportunity for Terrorism: TICs & TIMs

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<strong>Chemical</strong> <strong>Agents</strong> <strong>of</strong> <strong>Opportunity</strong> <strong>for</strong> <strong>Terrorism</strong><br />

Training Support Package<br />

Participant Guide<br />

Slide 32<br />

The Andrews nomogram depicts early lymphocyte depletion following radiation exposure<br />

and can also be used to estimate dose (exposure to radiation). The lymphocyte count is<br />

derived from the complete blood count mentioned in a prior slide.<br />

The left axis is the lymphocyte count, and the bottom axis is the time since exposure.<br />

The green lines represent dose estimates which relates on the right to prognosis. The<br />

more rapid the lymphocyte fall (depletion), the higher the likely radiation dose; and the<br />

more severe the ensuing clinical course.<br />

A fall <strong>of</strong> the lymphocyte count below 1000 cells/milliliter <strong>of</strong> blood within 24 hours after<br />

exposure suggests a dose over 6 Gy and a very severe course, while a drop below 1000<br />

cells/ml within 12 hours may indicate a lethal exposure <strong>of</strong> over 8 Gy range. .<br />

December 2008 Version 2.0 Page 395

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