-~17-
It would take 53,000 particles of the size illustrated
in Table III to reach the MPLB of 0.016 uCi which results
in 15 rem/yr to the entire
(1000 g)
lung.
however,
as
Table III indicates, these particles would irradiate only
3.4 g of this 1000 g to the lung, but at a dose rate of
4000 rem/yr-®,
Thus, as Table ITI indicates, these particles
result in an intense but highly localized irradiation.
fundamental question is, then:
irradiation more or
irradiation?
less
A
is this intense but localized
carcinogenic than uniform
Alternatively,
is the DF for this particular form
of irradiation equal to, greater than, or less than one?
the remainder of
this
section, we review the guidance,
more appropriately lack of quidance,
In
or
for dealing with this
hot particle problem.
22/ .Geesaman, Donald P., UCRL-50387, pp.
8, 15.
é
23/
Langham, Wright H., The Problem of Large Area Plutonium
Contamination,
U.
S$.
Dept.
of H.
E.
W.,
Services, Seminar Paper No. 002, Dec. 6,
24/
Long, A.B.,
25/
Geesaman, Donald P.,
Public Health
"Plutonium Inhalation:
1968, p. 7.
The Burden of
Negligible Consequence," Nuclear News, June 1971, p.
UCRL-50387,
pp.
8,
15.
71.
Based on
Geesaman's model for a lung at one-half maximum inflation.
Geesaman estimates a total of 68 alveoli at risk,
each
8x10-6 cm3 in volume, and deep respiratory zone tissue density
of 0.12 g/cm.
26/
See
footnote 23.
27/
Based on a lung mass of a standard man = 1000 g.
28/
This
assumes
that the
radiation
field
of
the
53,000
particles do not overlap.
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