applied to the specific period of the film badges and to the comparable activities of the exposed personnel, in order to validate the procedure and to identify personnel activities that could have led to atypical doses. Radiation dose from neutrons and dose commitments due to inhaled or ingested radioactive material were not detected by film badges (3; 4). Where required, these values were calculated and recorded separately. 7.5.1 Characterization of the Radiological Environment. This process described and defined the radiological conditions as a function of time for all locations of concern, that is, where personnel were positioned or where their activities took place. was divided into the two standard categories: The radiation environment initial radiation and residual radiation. The initial radiation environment resulted from several types of gamma and neutron emissions. Prompt neutrons and gamma radiation were emitted at the time of detonation, while delayed neutrons and fission-product gamma from the decay of radioactive products in the fireball continued to be emitted as the fireball rose. radiation, In contrast to these essentially point sources of there was gamma radiation from neutron interactions with air and soil, generated within a fraction of a second (5). Because of the complexity of these radiation sources and their varied interaction properties with air and soil, it was necessary to obtain solutions of the Boltzmann radiation transport equation (6). The radiation environment thus derived included the effects of shot-specific parameters, such as weapon design and yield, neutron and gamma output, source and target geometry, and atmospheric conditions. The calculated neutron and gamma radiation environments were checked for consistency with existing measured data. In those few cases displaying signif- icant discrepancies that could not be resolved, an environment based on extrapolation of the data was used if it led to a larger calculated dose, such as was done for reference 1. The residual radiation environment was divided into two general components: the neutron-activated material that emitted, over a period of time, beta and gamma radiation; and radioactive debris from the fission 170 Je 2.