The
two views were eventually cesoived,
meeting of the ICRU in 1928 (1).
a-radiation
was
defineu
specifications,
physical sense,
At this ;atherfag the “quantity” at
hoentgen,
eyual,
with
udcitizsnal
jJelalles
i.e., a8 a easure of the enerzy tluence.
to ambiguity among
dart
to
fact
that
ioWwever,
the woris “aruunt"”, “quantity”, anc “dose”, ina
air
ang
tissue
Save
riese
te
the
immeaiately
eda glecist al
to
the physictau's
“amount”,
f.e., cose.
the Roentgen was widely describea as
Thus almost
tne unit of x-ray "rose"
The ICRU in time endorsed
this preenptive move, as evidences by
adoption of
then the
the “rep” and
instrumentatlLon and
system fas conttaued
radiations.
necessitating
effectiveness (RBE),
were
The basic orinctole
the use of
stochastic agent transfer,
evaluation
in an
in
tutors
to estimate the provaollity of 3 serious cr
tne severity of
little or no help
the radlucthecapy :f
the above problem can de stated 45 fctilows =
ok
VTLS
this, an estimate of the dose is
of
sitn
the concept of relative diols
introduced into
For a physician (or anyone)
evaluatian of
the unit of absoried dese.
to wore well for HL, even when hish-LiT
involved in
labeled consequence of
rac as
tne later
the wse of phantoms fur teasurssent in
—
this
i
the pnysicist’s “quantity” of radiation vas cyuai-, or
proportional
improved
aftr.
in ie
to te interccreted
“cuantity” was
tne word
part
density,
the
seccce
to one electrostatic unit of chau le {2 one ho
ie of
It seems eviagent that
the
as
but only arter the
tA
TALI
ar
preterreu ‘s
-
-
:
That fs
quantity,
to say,
measured
a7
-
the next fall-cac. position.
this cegard.
obfectrortlented
PIL
-
7
Exposzte ts
needezt for
in
oc
f2r
ee
promesls
the
inditvtdual of concera.
Low-Level Radtation Exposure
It was
observed
quite
early
However, only much later was
that cancer
could
cesuit
from ELi.
it widely appreciated that the “single
cell-originating” effects, cancer and heritable effeccs, muss also be t3<ec.
seriously, even at very
{.e.,
following LLE.
involved fell intg
lor doses,
oc lacger doses at very iow dese rates,
[It was also apparent
the category of Fh, particularly its subciscizlines of
epidemiology and accident statistics.
adjust
500145!
that the basic phenomena
Huwever, no effort was mace
the basic quantities and units as demanded by
Chis ditferent
ts