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SEC ATTY CLASSIFIGAT ON OF = 15 PAGE
REPORT DOCUMENTATION PAGE
Ta AEPORT SECLAITY CLASSIFICATION
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Tp RESTRICTIVE MARKINGS
7 OISTRIBUTION/ AVAILABILITY OF REPORT
he
Approved for public release; distribution is
unlimited.
2b. DECLASSIFICATION / DOWNGRADING SCHEDULE
@ PERFORMING ORGANIZATION REPORT NUMBER(S)
5. MONITORING ORGANIZATION REPORT NUMBER(S)
WT-1621 (EX)
6a. NAME OF PERFORMING ORGANIZATION
$0. OFFICE SYMBOL
Naval Radfological Defense
(If applicable)
Laboratory|
7a. NAME OF MONITORING ORGANIZATION
Defense Atomic Support Agency
6c. ADORESS(City, Stare, and ZIP Code)
7. ADORESS(City, State, and ZIP Code)
San Francisco, California
Washington, DC
Ba. NAME OF FUNDING s SPONSORING
86 OFFICE SYMa8OL
ORGANIZATION
(if applicable)
de. ADORESS(City, State, and ZIP Code)
9
PROCUREMENT INSTRUMENT [OENTIFICATION NUMBER
10 SOURCE OF FUNDING NUMBERS
PROGRAM
PROJECT
TASK
ELEMENT NO.
11
NO
WORK UNIT
NO
ACCESSION NO
TITLE (inetude Security Classification)
OPERATION HARDTACK, PROJECT 2.3 - Characteristics of the Radioactive Cloud from Underwater
Bursts, Extracted Version
.
£. eeoBans Tiland T. H. Shirasawa
lia. TYPE OF REPORT
13b. TIME COVERED
FROM
TO
eae
1&
DATE OF REPORT (Year, Month, Day)
S$ °4Gz COUNT
201 ts
£34
'6 SUPPLEMENTARY NOTATION [his report has had sensitive military information removed in order to
provide an unclassified version for unlimited distribution.
17
Defense Nuclear
FIELO
18
18
ncy_in
COSATI COOES
GROUP
3
SUB-GROUP
8
The work was performed by the
18. SUBJECT TERMS (Continue on reverse if necessary
HARDTACK
i
and identify by block number)
Umbrella Shot
Fallout
Radioactive Cloyds
Wahoo Shot
19 ABSTRACT (Continue on reverse if necessary and identify by block number)
The purpose of this project was to (1) measure the complex gamma field at a number of
positions within 10,000 yards of each of the two underwater nuclear detonations (Wahoo and
Umbrella}; (2) collect lfmtted samples of airborne debris resulting from these detonations;
and (3) expose a number of test panels to this same debris.
The total gamma field was measured by means of about 20 gamma-intensity-time recorders
installed on floating platforms located within a radtus of 10,000 yards from surface zero.
Samples of radioactive materials deposited from the cloud were obtained by incremental
collectors associated with the basic gamma-intensity-time recorders. During both shots,
nearly all of the total gamma dose occurred within 20 minutes after zero time and was due
to the passage of airborne radioactive material.
20 OSTRIBUTION/ AVAILABILITY OF ABSTRACT
UNCLASSIFIED/UNLIMITED
(] same as RPT
22a NAME OF RESPONSIBLE INDIVIOUAL
Mark D. Flohr
DO FORM 1473, a4 mar
CJoric users
21
ABSTRACT SECURITY CLASSIFICATION
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22b TELEPHONE(Include Area Code) 22¢. OFFICE SYM8OL
(202) 325-7559
DNA/ISCM
83 APR edition may be used until exhausted.
All other editions are obsolete.
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