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ASSOCIATED UNIVERSITIES, INC.
Upton, New York 11973
Safety & Environmental Protectan Division
(516) 345- 4207
April 1, 1980
T.F.
Division of Health and
Environmental Research
U. S. Department of Energy
Washington, D. C.
P, N . N. L.
REPOS!TGRY
McCraw
20545
COLLECTION Narshall ZF sia ” as
(DOE)
BOX No,
.
Dear Tom:
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FOLDER
v
In response to your question concerning the annual bone marrow dose
equivalents, we have constructed Table 4 which lists those individuals whose
red bone marrow dose equivalent exceeded 500 mRem in one year.
In this table
as with the annual total body dose equivalent table, one year is defined as
the 12 consecutive months beginning September 1 and concluding August 31.
During the year 1977 (9/1/76 to 8/31/77), 4 individuals exceeded the
annual total body dose equivalent and 28 individuals exceeded the annual red
bone marrow dose equivalent of 500 mRem in cne year.
In the year 1978 (9/1/77
to 8/31/78), 22 individuals exceeded the annual total body dose equivalent and
49 individuals exceeded the annual red bone marrow dose equivalent of 500 mRem
in one year.
The higher number of persons who exceeded the annual dose equivalent to
the red bone marrow is the result of the red bone marrow receiving a higher
photon.dosa relative to most other tissues in the body.
When absorbed into
the blood, cesium is widely ciistributed among the body tissues, miscle having
the highest concentration.
Since muscle is widely distributed in the body,
cesium is considered to irradiate the entire body.
There is some buildup of
the dose from photons in organs near the center of the trunk with smaller
values of dose for organs near the surface. This variation is as much as a
factor of two. Thus, there are individuals with annual total body dose
equivalents less than 500 mRem in one year but with annual red bone marrow
dose equivalents in excess uf 500 mRem in one year.
DOCUMENT DOES NOT CONTAIN ECI
Reviewed by Epohe,r) Date
NS?
If we can be of further service, please do not hesitate to contact
Bob Miltenberger or Ed Lessard at FTS 666-2503, or me at 666-4250.
cerely,
. MC:
At
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We.
Robison
3. Wachholz
Greenhouse