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OPERATION SUN BEAM SHOTS LITTLE FELLER I AND II, JOHNIE BOY, AND SMALL BOY PROJECT OFFICER'S REPORT-PROJECT 2.3 NEUTRON FLUX MEASUREMENTS ( 6-14-63 ) (DELETED)

RIGOTTI, D L [NUCLEAR DEFENSE LABORATORY, US ARMY]; MCNEILLY, J H [NUCLEAR DEFENSE LABORATORY, US ARMY]; BRADY, R E [NUCLEAR DEFENSE LABORATORY, US ARMY]; TARBOX, J L [NUCLEAR DEFENSE LABORATORY, US ARMY]

DOMINIC II OPERATION; LITTLE FELLER I EVENT; LITTLE FELLER II EVENT; JOHNIE BOY EVENT; SMALL BOY EVENT; RADIATION DETECTORS; NEUTRONS

Location - DOE/NNSA NUCLEAR TESTING ARCHIVE Address - P.O. Box 98521 City - Las Vegas State - NV Zip - 89193-8521 Phone - (702)794-5106 Fax - (702)862-4240 Email - NTA@NV.DOE.GOV

REPORT

1985 Sep 01

Sanitized

0081

NV0051096

POR2264EX

1994 Aug 26

2003 Sep 18

THE OBJECTIVES OF THIS PROJECT WERE (1) TO MEASURE FREE-FIELD NEUTRON FLUX AND SPECTRUM AS REQUIRED IN SUPPORT OF OTHER PROJECTS; (2) TO DOC UMENT THE NEUTRON FLUX VERSUS GROUND RANGE; AND (3) TO DETERMINE THE E THE OBJECTIVES OF THIS PROJECT WERE (1) TO MEASURE THE FREE-FIELD NEUT RON FLUX AND SPECTRUM, (2) TO DOCUMENT THE NEUTRON-FLUX VERSUS GROUND RANGE, AND (3) TO DETERMINE THE EFFECT OF VARIOUS BLAST CONTAINERS AND SHIELDS ON DETECTOR ACTIVATION. A TOTAL OF APPROXIMATELY 900 NEUTRON-F LUX MEASUREMENTS WERE MADE WITH THE FOLLOWING DETECTOR MATERIALS: GOLD , URANIUM-235, PLUTONIUM, NEPTUNIUM, URANIUM-238, SULFUR, MAGNESIUM, A LUMINUM, AND ZIRCONIUM. THE FOLLOWING CONCLUSIONS WERE REASCHED: THE N EUTRON SPECTRUM FROM ALL FOUR SHOTS, WITH THE EXCEPTION OF THE THERMAL NEUTRONS, DID NOT CHANGE WITH INCREASING DISTANCE FROM GROUND ZERO AFT ER THE FIRST 100 YARDS. THE THERMAL NEUTRON FLUX AT 150 FEET FROM GROU ND ZERO WAS HIGHEST CLOSER TO THE GROUND FOR SHOT LITTLE FELLER II. TH E THERMAL NEUTRON FLUX AT 150 FEET FROM GROUND ZERO INCREASED SLIGHTLY WITH INCREASING HEIGHT ABOVE THE GROUND (TO A HEIGHT OF 20 FEET) FOR S THERE WAS NO REDUCTION IN THE GOD-NEUTRON-DECTOR ACTIVATION DUE TO THE BLAST SHIELD. THE NEUTRON DOSE FROM SHOTS LITTLE FELLER I AND II ON A PER TON BASIS AGREED VERY WELL WITH THAT MEASURED AT SHOT FIG, OPERATI ON HARDTACK. THE NEUTRON DOSE MEASURED FOR SHOT SMALL BOY WAS IN EXCEL LENT AGREEMENT WITH THE PREDICTION FROM TM 23-200 AT 900 FEET AND INCR EASED HIGHER THAN TM 23-200 AT 1800 FEET; HOWEVER, THIS WAS STILL WITH IN THE STATED DEGREE OF RELIABILITY. EXCELLENT AGREEMENT (WITHIN 20 PE RCENT) WAS ATTAINED BETWEEN THE MEASURED NEUTRON DOSE FROM SHOT SMALL BOY AND AN EMPIRICAL PREDICTION METHOD DERIVED BY THE ARMOUR RESEARCH FOUNDATION. HOWEVER, CERTAIN PARAMETERS, NECESSARY TO EVALUATE THIS PR EDICTION, WERE OBTAINED FROM SHOT OSAGE, A DEVICE OF SIMILARY YIELD DE TONATED AT OPERATION REDWIG; THIS INFORMATION WAS NOT AVAILABLE FOR SH OT SMALL BOY AT THE TIME THIS REPORT WAS WRITTEN. THUS, THE AGREEMENT