COUNTS / 455 MINUTES
ror?
OCTOBER
— —
|
r
/ |
C
-
——
2-9-60 455 mint
----- 1-17-60 455 min
5"x 4" Nol crystal
a
r
1959
|
|
Difference
i
\
\_
\
!
i
\
l
\
|
\
\-
Ye
/
_
\ ~~ 7
7
/ Nb?? \
\
4
\
|
\
|
17
Ny/
:
:
fzr3
\
}
—_
\
~
.—Be’ Standard
FE
|
4
O
|
0.25
|
i
0.5
Y-ENERGY
0.75
(Mev)
Fig. 1 -- Gamma-ray spectrum of ashed air filters