Sr, Ba, Zr, Ce, R.E., Cs, Mo, AND Te
40 ML FUMING HNO, + 10 ML HCIO,
TO ML H,SQ,—~ DRYNESS
2 ML H,SO, + 10 ML HF — DRYNESS
TRANS. € H,O + 3 DROPS H,O,
!
BaSO, AND Sr50,
+
CO, = METATHESIS
~_
’
BaCO; AND SrCO;
'
Zr, Ce, R.E., Cs, Mo, AND Te
HBr ~ DRYNESS
3N HCI
50;
y
Je
zr, Ce, R.E., Cs, AND Mo
6N NaOH
y
Cs AND Mo
Zr, Ce, AND R.E.
Seeeiiieniien Gime
i
HC! AND #,5
DILUTE HNO,
¥
Mo255
HF
Cs
!
HySiQ, ° 12WO3
R.E.F, AND CeF,
HBO, + HNO,
C5gSiW2Op
.
{
R.E.
0.35M HIO,
a
~—t
{
NaBrO,
Zr
Ba
BaZrF,
Ce(1O3)4
| NaOH
R.E.{OH),;
Fig. 1—Sequential separation of particle radionuclides.
Gamma spectra of individual particles were obtained with a 3- by
3-in. Nal detector and a 400-channel pulse-height analyzer. The particles were analyzed as early as two days after the shot and thereafter
once every two particle half-lives.
In general, six spectra per particle were obtained over a two-year
period. Particles studied ranged in size from 2.5 to 25u and contained
10° to 10!! *Zr fissions. The gamma spectra were normalized prior to
gamma-spectra stripping by a computer program written in FORTRAN
for the IBM-7094. This program has a capability for the determination
of Zr, Mo, ‘cs, “ce, 4ce,Ba, and 7Np, as well as for others,
and is based on the method proposed by Carnahan.’ The isotopes men-