Islands from the first shot of Operation CASTLE are considered. Data were
summarized from field Radiological Safety surveys, fall-out radiochemical
studies, and fall-out gamma spectral measurements. The influence of these
and other factors on an evaluation of survey meter response and total dose
estimates was considered. Estimates of fall-out duration times and energy
distribution of the dose from a plane source were made and the effect of
diffuse source-geometry on the depth-dose to air-dose relationship was
considered.
Superficial doses from soft gamma and beta radiation were also
considered. Since the fall-out incident created an initial emergency during
which data collection was of secondary importance, attempts to reconstruct
the event have been uncertain. However, a fairly consistcnt estimate of
external gamma dosage was possible, although the question of beta exposure
remains mostly unanswered. It was assumed that no siginificant neutron or
alpha particle exposure occurred. Internal doses from inhaled or ingested
material and the biomedical aspects of the incident have been discussed in
other CASTLE reports. lt was concluded that the AN/PDR39A requires a
correction factor 0; about plus 20% in doserate readings made under the
conditions described; decay of the radioactivity of the fall-out is
believed expressible by the factor of T/sup -0.83/; the external gamma dose
was delivered priroarily by radiation energies of 100,
700,
and 1500 kev;
the beta dose was delivered by beta radiation of maximum energies of 0.3
and 1.8 Mev, mostly from fallout deposited on the skiin itself;
exposures occurred between 4 and 78 hours after the detonation,
the
the
fall-outs were probably of 12-hours duration; diffuse source geometry
increased the-midline dose by abcut 50% compared to the midline dose which
would have resulted from a bilateral narrow beam exposure of the same
air-dose; error in the estimates is believed to be less than 50%; and total
air gamma doses were estimated as follows: Rongerik, 56 r; Rongelap, 182 r;
Ailinginae, 81 r; and Utirik, 13 r. (auth)
Descriptors:
AIR; BETA DECAY; DECAY; DISTRIBUTION; DOSEMETERS; ENERGY;
ERRORS; FALLOUT; ISLANDS; MAN; MARSHALL ISLANDS; NEUTRONS; NUCLEAR
EXPLOSIONS; PACIFIC OCEAN; POPULATIONS; PROJECT CASTLE; RADIATION DOSES;
RADIATION SOURCES; RADIOACTIVITY; RADIOCHEMISTRY; SAFETY; SKIN;
SPECTROMETERS; THERMONUCLEAR EXPLOSIONS i10000000000000000000000
Subject Codes (NSA): BIOLOGY AND MEDICINE
10/5/206
116506
(Item 206 from file:
NSA-14-000028
109)
THE ARTIFICIAL RADIOACTIVITY IN RAIN WATER OBSERVED
AUGUST 1954
IN JAPAN FROM MAY TO
Miyake, Y.
Meteorological Research Inst., Tokyo
Papers Meteorol. and Geophys. (Tokyo)
v 5.
Publication Date: (1954) Sept.
173-7 p.
Journal Announcement: NSA14
Document Type: Journal Article
Language: English
Data are summarized on levels of radioactivity in samples of ait-borne
dust and rain water collected in Japan following the thermonuclear weapons
tests at Bikini atoll from March to May 1954.
(C.H.)
Descriptors:
AIR; BIKINI; DUSTS; JAPAN; NUCLEAR EXPLOSIONS; QUANTITY
RATIO; RADIOACTIVITY; RAIN; SAMPLING; TESTING; THERMONUCLEAR EXPLOSIONS
Subject Codes (NSA): BIOLOGY AND MEDICINE
10/5/207
(Item 207 from file:
115568
NSA-13-022235
109)
INTERPRETATION OF SURVEY-METER DATA.
ANNEX 6.5 OF SCIENTIFIC DIRECTOR’S
REPORT OF ATOMIC WEAPON TESTS AT ENIWETOK, 1951.
OPERATION GREENHOUSE
Tochilin, E.; Howland, P.
Naval Radiological Defense Lab., San Francisco
Publication Date: Aug. 1951
134 p.
Primary Report No.: WT-26
Note:
Decl.
Mar.
6,
1957
Journal Announcement: NSA1
Availability: NTIS
3 0 0 3 J 4 |
Document Type: Report