ground zero, received exposures of 10, 7.5, and 5 roentgens. An
Army photographer who entered the test area six times between 23 July
and 20 October received 12.2 roentgens (1).

Four individuals involved with excavating the buried supports of the
TRINITY tower from 8 October to 10 October 1945 received gamma
exposures ranging from 3.4 to 4.7 roentgens. Film badge readings for
this three-day period indicate that the two individuals who operated
mechanical shovels received 3.4 and 4.3 roentgens, while the two who
supervised and monitored the excavation received exposures of 4.2 and
4.7 roentgens. The individual receiving 4.7 roentgens during the
excavation operation had received 1.3 roentgens from a previous
exposure, making his total exposure 6 roentgens (1).

An Army captain who accompanied all test and observer parties into the
ground zero area between 1 September and 11 October 1945 received a
total gamma exposure of 2.6 roentgens (1). The activities and times
of exposure are not known for other personnel with exposures over 2
roentgens.

According to the dosimetry records for 1946, about 115 people visited
the test site that year. No one ventured inside the fence surrounding
ground zero, and no one received an exposure greater than 1 roentgen
(1; 16).

REFERENCE LIST

The following list of references represents the documents consulted in
preparation of the Project TRINITY volume.

AVAILABILITY INFORMATION

An availability statement has been included at the end of the
reference citation for those readers who wish to read or obtain copies
of source documents. Availability statements were correct at the time
the bibliography was prepared. It is anticipated that many of the
documents marked unavailable may become available during the
declassification review process. The Coordination and Information
Center (CIC) and the National Technical Information Service (NTIS)
will be provided future DNA-WT documents bearing an EX after the
report number.

Source documents bearing an availability statement of CIC may be
reviewed at the following address:

Department of Energy
Coordination and Information Center
(Operated by Reynolds Electrical & Engineering Co., Inc.)
ATTN: Mr. Richard V. Nutley
2753 S. Highland
P.O. Box 14100
Las Vegas, Nevada 89114

Phone: (702) 734-3194
FTS: 598-3194

Source documents bearing an availability statement of NTIS may be
purchased from the National Techn