APPENDIX D: IMP DETECTOR HISTORY
The table below gives, for each detector used in the project, the IMP in which the detector was
installed, the area factor, the location measured, and comments. Blanks in a column mean that the
information is the same as above. Naming an island as the IMP location means that stakes were
being measured on that island during the dates shown. Inclusive dates do not necessarily mean the
Measurements were made on each date included. The physical location of the detector is shown.
Thus, for soil screening, the location is the IMP or Crypt shed, or Belle, rather than the island from
which the soil sample was obtained. The origin of the sample is sometimes noted in the comments.
The serial number of the detector in use is recorded at position 32 of the data array stored for each
IMP measurement, for all measurements taken after March 28, 1978. Prior to that date, the IMP
serial number, which is stored in position 8, may be used along with the tabular data, to associate
detector and site measured.
Date
IMP
Area Factor
Location
Comment
DETECTOR 386 (Radiation Lab IG2)
1977
6/20
7/7
8/21
12/26-12/28
-
1.00*
PGT
1.00
Las Vegas
3
Janet
Pearl
Shipped to Enewetak on
IMP 3
Sally
Irene
In use on islands noted,
together with detector 393
Ene wetak
Evacuation for Typhoon Mary
Vera
Olive
3
Test Date
Area Factor = 0.99;
1978
1/2-1/4
3
Sally
1/7
1/12
1/17-1/19
1/20-1/23
3
1
1
3
1/25
1&3
1/27,1/28
3
Janet
1/30-1/31
2/1-2/3
3
Janet
1/24
1/26
3
Janet
IMP Shed
1
Tropical Storm Nadine
Replaced cables to detector
Detector iced up
De-iced
No signal thru
Replaced preamp - OK on
IMP 1}
Malfunction/wide Am peak/
to Radiation Lab
Working but replace preamp
Bad peak shape/Adjust
amplifier
*Value assigned. For area factors within 5% of the previously reported or assigned value, no change
in area factor was made.