in various activities during Project TRINITY. The sources of this
dosimetry information are the safety and monitoring report for
personnel at TRINITY, which includes a compilation of film badge
readings for all participants up to 1 January 1946, and film badge
data from the records of the Reynolds Electrical and Engineering
Company, which contain readings through 1946 (1; 16). These sources
list individual participants with their cumulative gamma radiation
exposures.


4.1 FILM BADGE RECORDS

During TRINITY, the film badge was the primary device used to measure
the radiation dose received by individual participants. The site
monitoring plan indicates that film badges were to be issued to
participants. The film badge was normally worn at chest level on the
outside of clothing and was designed to measure the wearer's exposure
to gamma radiation from external sources. These film badges were
insensitive to neutron radiation and did not measure the amount of
radioactive material that might have been inhaled or ingested (1).

Personnel from the Medical Group had responsibility for issuing,
receiving, processing, and interpreting film badges for Project
TRINITY. The Site Monitoring Group compiled the film badge records
for both onsite and offsite personnel. Radiological safety personnel
and military police recorded the names and identification numbers of
individuals as they entered the test area. This information was
recorded in an entry logbook and on a personal exposure data card.
Upon leaving the test area, individuals returned their film badges to
the check station. When the film badges were processed and