An external dose reconstruction involving a radiological dispersal device

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Title: An external dose reconstruction involving a radiological dispersal device
Author: Hearnsberger, David Wayne
Abstract: Recent events have underscored the need for the United States government to provide streamlined emergency response procedures and subsequent dose estimations for personnel responding to incidents involving radioactive material . Indeed , the National Council on Radiation Protection and Measurements Report No . 138 (NCRP 2001 ) indicates that exposures received by first responders will be important for a number of reasons , including planning for the appropriate use of key personnel in an extended emergency situation . In response , the Department of Homeland Security has published Protective Action Guides (DHS 2006 ) to help minimize these exposures and associated risks . This research attempts to provide some additional radiological exposure knowledge so that an Incident Commander , with limited or no information , can make more informed decisions about evacuation , sheltering -in -place , relocation of the public , turn -back levels , defining radiation hazard boundaries , and in -field radiological dose assessments of the radiation workers , responders , and members of the public . A method to provide such insight begins with providing a model that describes the physics of radiation interactions , radiation source and geometry , collection of field measurements , and interpretation of the collected data . A Monte Carlo simulation of the model is performed so that calculated results can be compared to measured values . The results of this investigation indicate that measured organ absorbed doses inside a tissue equivalent phantom compared favorably to the derived organ absorbed doses measured by the Panasonic thermoluminescence dosimeters and with Monte Carlo ? ? ? ? ? ?N ? ? ? ? ? ? Particle modeled results . Additionally , a Victoreen 450P pressurized ion chamber measured the integrated dose and these results compared well with the Panasonic right lateral TLD . This comparison indicates that the Victoreen 450P ionization chamber could potentially serve as an estimator of real -time effective dose and organ absorbed dose , if energy and angular dependence corrections could be taken into account . Finally , the data obtained in this investigation indicate that the MCNP model provided a reasonable method to determine organ absorbed dose and effective dose of a simulated Radiological Dispersal Device in an Inferior -Superior geometry with Na99mTcO4 as the source of radioactive material .
URI: http : / /hdl .handle .net /1969 .1 /4759
Date: 2007-04-25

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An external dose reconstruction involving a radiological dispersal device. Available electronically from http : / /hdl .handle .net /1969 .1 /4759 .

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