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IMPULSE LETHALITY
&Dy om HB
1600
4
™
t+ tt
6
810
[5
20
30 40
a
tuted
Et
69 Gi00
TIME FROM BEGINNING OF EXPOSURE
I
[O20 soo4co GOO
(DAYS)
Figure V.
A plot of the impulse lethality funetion versus time from the beginning of
exposure in duratton-of-ltfe experiments.
The data are for LAF1 male (solid line) and female (broken line) mtce
exposed to cobalt-60 gamma radiation. Data from Sacher and Grahn [Sh].
However, the formulation of this theory is not sufficiently developed and may
be regarded as a first attempt towards a more comprehensive treatment.
119.
In another paper Sacher, Grahn, Fry et al.
[S5] examined the Late ef-
fects of gamma-radiation in respect to two major categories of effects: the
incidence of tumours of the reticular tissue and the life-shortening induced
by all causes other than the reticular tumours.
The data were obtained from
male and female mice of four different genotypes exposed in duration-of-life
experiments (6, gamma rays, 0.3 to 56 R/day).
In agreement with that ob-
served on the LAF1 mouse [S4] the data showed that the log mean after-survival
plotted as a function of the daily dose followed a very nearly straight line.
120.
The Gompertz transforms of these data (see Figure VI) for all causes of
death were slightly convex upward and formed a fan of lines of increasing slope
with increasing dose-rate with small differences between genotypes.
When the