cent or better,
Results of analyses on cloud sanples are included to
allow comparisons between fallout and cloud material.
The cloud samples
were portions of filter paper collections made for radiochemical deter~
minations of weapon yield by LASL and UCRL.
5.2.3
Fractionation
5.24
Fission Yield Curves
53
INDUCED
ACTIVIT
Analyses for Na@4, K42, Mg28, 0138, Np239, 0237, and 0240 were
performed on cloud and fallout samples.
However,
because of the diffi-
culty of obtaining early samples only Na@4, Np239, 0237, and U240 were
detected.
The fallout samples analyzed at the site were aliquoted as
described in Section 3.1,
The remainder of these samples and tie
cloud sanaplss were analyzed at USNEDL.
5.3.1
Radiochemical Procedure
Radiochemiceal dete
tions were made according to either
standard published procedure
or those developed at USNRDL.
outlined here and described more fully in Appendix A.
cedure.
They are
Na*4 was separated from the gross activity by a two-step pro-
First, the alkali metal fraction was separated from the gross
activity by ion exchange. Then, Na®4 was isolated by a gravimetric
procedure employing the specific precipitation of sodium zinc uranyl
123
4.
SECRET — RESTRICTED DATA
142
delefed.