=
114
TABLE 54.
Summary or DEFINITIONS USED IN NorRMALIZATION PRocEDURE FOR ?2Th anp 2@Ra
Quantity
|
22h
Activities in injection material |
|
28h
Bo
Co
A = ady
B
C
7
f= “Ra
1
22TH
|
|
AL
Aa
|
_
|
Steady state activity ratio at
f=
Deeay constants
28Ra
Ag
at time of injection
Activities in tissue sample at
time ¢ after injection
|
|
Bateman coefficients for growth
and decay of ?8Ra (see Figure
88}
Growth from *?Th of type II #*Ra
Bateman coefficients for growth
and decayof #°Th (see Figure
88)
Growth from ??Th of type HI *8Th
b
’
ods
C1
|
e
= Ne
hyd
—e
?
Az
hat
2
bs =e
Growth from 74Ra of
eo _ et
dye
eu —e™
Ag —*
Aa — de
type II ?8%Th
‘
~ (Xe — &)
_ ™sTh:
BERa
Decayof type I 2*%Th
—Ayt
(Ae — &)
2
et? —e 3°
‘Cy =
| ,
Decay of type |
C3 = ewhye
SO
AB — ha
‘) This is taken to mean the material actually administered, which is not necessarily the same as the material in the an
or even the material in the syringe.
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Fic, 88.--Bateman coefficients for the growth and decayof ?*Ra and ?8Th
same proportionsaf,f2/fife amongthe tissues as do 28Th
atoms of type III, and with a whole-bodyretention of
fifz. Type I 28Th atoms, however, must be treated
somewhatdifferently since they do not growzn vivo from
8Ra and, therefore, cannot depend on theratio fi/fi .
Thus it cannot be expected that type I “*Th atoms will
behave in the same manneras the atomsof types IT and
IJ; rather they bear an analogy with type I *8Ra
atoms. In the case of #8Ra, one is interested in the
tion: what fraction of the atoms in the injectior
terial is carried by the Thorotrast particles? For 1
8Th, exactly the same question arises. Therefor
analogy with ?8Ra it will be assumed that the v
body retention of type I ?8Th atomsis fz and th:
retained atomsare distributed among the tissues |
time of measurement in the proportions af2/fe.