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"The crew wore two testing devices. One was a film badge… literally made of photographic film which was worn on our belts. The other was a dosimeter which was like a ballpoint pen which we wore in our shirt pockets and would record any radiation."

Chapter 3 discusses the radiological safety criteria and procedures in effect for Project TRINITY, and chapter 4 presents the results of the radiation monitoring program, including information on film badge readings for participants in the project.

The Site Monitoring Group compiled the film badge records for both onsite and offsite personnel.

The guards' film badge readings showed an average daily exposure of 0.02 roentgens.

During TRINITY, the film badge was the primary device used to measure the radiation dose received by individual participants.