part of the fallout would take about the same amount of time to descend on the island, even though the lighter parts took longer. Ranges of fallout time and the dose that would result from them were calculated as follows: Location Dose in Rads* Fallout Time 16 hr. 8 hr. Rongelap Ailinginae Rongerik Utirik . 159 r 724 704 12 ¢r 209 92 106 15 r Xr r xr Since it was believed that the fallout time was less than 16 hours, and “because of data from other sources, the figure used for the report, and the reports from that time on were based on a fallout of 12 hours:** Location Best Estimate of Gamma Dose Rongelap Ailinginae Rongerik in Air 175 r 69 r 78 x Utirik 14 r One additional factor of interest concerns the effect of a field, or area, of fallout as opposed to that of X-rays. Particles of a single energy from an X-ray machine come from a "point", or single source. However, particles in a fallout field, are not emitted from a single source, but many. They are emitted from a 369° circle around the person as he stands or walks and they are at different energies. Jt is as though the person is constantly being irradiated by X-ray machines of different enerpies, placed around him in a *From "Some Effects of Lonizing Radiation on Man", p. 6 oe es: **Tbid, p. 3 50103b3 96