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APPENDIX '"'C"
INCOMING TELETYPE
SEPT 10, 1957
FM LOS ALAMOS SCIENTIFIC LAB LOS ALAMOS NMEX
TO USAEC WASHDC.
INFO ZEN/UCRL LIVERMORE CALIF
S-O91A
QO 10232124
PERSONAL FOR STARBIRD, COPY TO SEWELL FROM FROMAN,
REURTT ON PROVING CLEANLINESS OF WEAPONS TO INTERNATIONAL GROUP,
ONLY REALLY CONVINCING PROOF MUST CONTAIN BELIEVABLE DATA ON
TOTAL YIELD AND ON EITHER FISSION YIELD OR THERMONUCLEAR YIELD.
A CONVINCING VALUE OF TOTAL YIELD CAN BE DETERMINED BY IIYDRODYNAMIC TECHNIQUES SUCH AS BALL OF FIRE, SHOCK ARRIVAL TIME, OR
SHOCK INTENSITY WITHOUT REVEALING DESIGN INFORMATION,
PAST
EXPERIMENTS INDICATE THAT A CONVINCING VALUE OF THE FISSION
YIELD CAN BE MEASURED BY AN ABSOLUTE MEASUREMENT OF THE GAMMA
RADIATION FROM THE BALL OF FIRE DURING THE PERIOD FROM ON TIO
TEN SECONDS AFTER DETONATION,
MAIN SOURCE OF GAMMA RADIATION
BETWEEN FIVE AND TEN SECONDS IS FISSION FRAGMENTS SINCE
NUTRONS RELEASED TO ATR HAVE DISAPPEARED AND CONTRIBUTION
FROM ACTIVATED SODIUM ETC, IS NEGLIGIBLE AT THIS TIME,
BECAUSE
OF AIR DISPLACEMENT DUE TO SHOCK, BEST ACCURACY CAN BE OBTAINED
IF RECORDING STATION IS FAIRLY CLOSE (PERHAPS BETWEEN ONE AND
TWO THOUSAND YARDS) TO TEST DEVICE,
AN ACCURACY WITHIN A
FACTOR OF ONE AND ONE-HALF OR TWO SHOULD BE POSSIBLE WITH THE
CHIEF UNCERTAINTY BEING IN THE ESTIMATE OF ATTENUATION BETWEEN
SOURCE AND DETECTOR,
THIS WOULD GIVE FRACTION OF BOMB ENERGY
- 1o -
Appendix "C"
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