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Revised dose estimates for the criticality excursion at los alamos scientific laboratory, may 21, 1946.

01 Jan 1967-

AboutThe article was published on 1967-01-01 and is currently open access. It has received 6 citation(s) till now. The article focuses on the topic(s): Criticality.

Topics: Criticality (61%)

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LOS ALAMOS SCI ENTIFIC
LABURAT~T'RY
of
the
University
of
~alifornia
I
LOS ALAMOS
NEW
MEXICO
Revised Dose Estimates
for the Criticality
Ex-mlrsion
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May
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1946
UNITED
STATES
ATOMIC ENERGY COMMISSION
CONTRACT W-7405-ENG.
36

DISCLAIMER
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Government or any agency thereof.

DISCLAIMER
Portions of this document may be illegible in
electronic image products. Images are produced
from the best available original document.

LEGAL
NOTICE
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ww
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M
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opoimored
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Commtssion, nor
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actlllg
oa
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Commheioa:
A.
Makes
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Commission,
or employee of ouch contractor prepares.
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hientific
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LA-3861
UC-41, HEALTH
AND
SAFETY
TID-4500
LOS ALAMOS SCl ENTl FlC LABORATORY
of the
University of California
.
.
LOS ALAMOS
NEW
MEXICO
Report written: December
1967
Report distributed: April
25,
1968
Revised Dose Estimates
for the Criticality Excursion
at
Los5 Alamos Scientific Laboratory
May
21,
1946
Dale
E.
Hankins
G.
E.
Hansen
TMs report was prepared
as
an account of Government sponsored work. Nellher the Unlted
Swtea, nor the Commlsslon, nor any person actlng
on
behalf of the Commlsslon:
A. Makes any warranty
orrcprcsentatlon, expressed
or
Implled, wlth respect to the accu-
racy, completeness,
or
usefulness of the InformnUon cantolned In thls report,
or
that the use
of any
InformaUon, apparatus, method. or process dleclosed In
thls
report may not lnfrlnge
privately
owned rlghts;
or
8.
Assumes any llnbllltlco wlth rcopcct to the use of, or
for
damages
~.edulUrg
IL.UUI
Lhe
use of any InIormntlon, appnratus, method, or process dleclosed In thla report.
As used In the above. "person
actlng
on
behalf of the Commlsslon" Includes any em-
ployee or contractor of the Commission,
or
emp~oyke of such contractor, to the extent that
such employee or contractor of the Commlsslon,
o:
employee of such contractor prepares.
j
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nr
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with
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Anntmctor.
I

Citations
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TL;DR: Ce bilan est un repertoire des accidents radiologiques les plus importants survenus pendant la periode 1945-1985 and qui sont presentes d’une facon sommaire.
Abstract: Ce bilan est un repertoire des accidents radiologiques les plus importants survenus pendant la periode 1945-1985 et qui sont presentes d’une facon sommaire. La plupart des informations incluses ont ete obtenues dans la bibliographie scientifique. Ce document est principalement destine aux professionnels qui travaillent dans le domaine de la surete des installations nucleaires et radioactives.

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Abstract: As part of the preliminary design for a proposed nuclear fuel reprocessing plant to be located near Oak Ridge, Tennessee, Exxon Nuclear Company, Inc. has made an extensive analysis of the environmental effects to the public from accidents occurring within the reprocessing complex. Each plant system was reviewed for its response to a spectrum of abnormal events, including natural phenomena, utility failures, equipment failures, operating errors, and process upsets. The analysis has shown that the plant is designed with sufficient confinement barriers and redundancy that in-plant accidents would not result in excessive radiation doses to the public. 2 figures, 1 table.

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Abstract: During the Second World War, Canada made several important contributions to wartime nuclear research efforts. The three main contributions were: establishing a domestic nuclear research laboratory ...

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Proceedings ArticleDOI
23 Jul 2000
TL;DR: This work of historic character and interest, examines the mechanical, physical, dosimetric and clinical aspects of the first criticality accident in history, the so called LA-1 (for Los Alamos-1) event, reference is made to the volume of literature this event has generated in the past 30 years and attempts to interpret this literature.
Abstract: This work of historic character and interest, examines the mechanical, physical, dosimetric and clinical aspects of the first criticality accident in history, the so called LA-1 (for Los Alamos-1) event, reference is made to the volume of literature this event has generated in the past 30 years and attempts are made to interpret this literature. On August 21 1945, the first uncontrolled criticality excursion in history occurred at the Los Alamos Scientific Laboratory, in New Mexico. In 1952 Hempelmann published what until the mid 1960's was considered the definitive account of the accident. Subsequently, a number of then secret but recently declassified studies have seriously questioned Hempelmann's account. The accident occurred during the course of experiments with a subcritical 6.19 kg. sphere of Pu-239. The operator, aware of the risks, decided nevertheless to control the experiment manually since a reliable remote control mechanism was not available. The sphere was surrounded with enough tungsten carbide bricks of high neutron reflectivity to just bring the structure to criticality. For reasons that remain unclear to this day, the neutron flux increased abruptly and attempting to remove one of the bricks, the operator accidentally dropped it on top of the Pu sphere. The assembly instantly achieved prompt-criticality releasing such power that a bright blue light (Cerenkov radiation) illuminated the newspaper that a security guard was reading at distance of 4 m. The operator manually removed the fallen brick and the structure reverted to a subcritical state. Based on careful physical reconstructions and numerical simulations of the accident, the neutron-gamma exposure rate around the structure was estimated to be of the order of 10/sup 8/ R/sec. The operator was admitted to Los Alamos Hospital and within hours developed severe leukopenia (3000 mm/sup -1/) and was placed in a reverse isolation chamber with positive pressure. He was treated with high doses of antibiotics and blood coagulating agents, in addition to the administration of multiple blood transfusions. He expired on the 29/sup th/ day after the accident from generalized infection. The security guard survived for 33 years and his clinical evolution until death from acute myelogenous leukemia is presented.