-
8
MET
pi pi
pi Bam137 .
Soddy Rutherford pi pi. t=0 pi pi 0, pi pi pi pi pi pi t pi
:
t0eN)t(N = 8.1
pi,
pi pi pi
pi . pi
pi 1/2 :
2/12/1 T693.0
T2ln
== 8.2
pi pi pi pi
pi . pi
R(t) = )t(Ndt
)t(dN = 8.3
pi.
Cs137 pi 30.17 pi pipi pi
-
( pi 94.6% ) Ba137 (. 8.1). pi pi pipi 661.6 keV, pi 8.1 2.55min
pi pi pi -
pi 10-10 10-15 s. (isomeric metastable) m ( Bam137 ). pi Bam137
( 2.55 min ) pi pi . pi pi Bam137
-
t0eRR
=
pi 0. pi Bam137 pi Bam137 pi
t . (8.1):
8.4
lnR=lnR0 - t 8.5
pi R0 . pi pi pi pi pi
(8.5) 8.2.
8.1 pi pi Cs137 .
pi pi
(Tl) pi (MCA) 1024 pi (MCS). ( ) pi pi pipi t pi pi pi .
pi pi pipi
t . pi Bam137 pi pi pipi pi pi pi Cs137 Bam137 pi pi pi
. pipi pi pi
30.17 y 7/2+
11/2- 661.6 2.55 m
3/2+ 0
Cs 137
55
1/2+ 281
94.6%
\
5.4 %
900
-
Ba 137
56
-
pi, pipi Cs137 (30 y) pi pi 2 h , pi Cs137 pi . pi Bam137 pi
Cs137 pi , HCl pi pi a pi ( 8.2)
8.2 pi Ba pi Cs.
pi
1. (Tl) MCA 2. Cs137 , pi Na22 , Cs137 , Mn54
1. , .pi, , 2002, . 88.
1. pi pi Na22 Mn54 . pi
pipi pi Cs137 . 2. pi 661.6 keV
pi .
pi LLD (Lower Level Discriminator) ULD (Upper Level
Discriminator) pi pi
pi 661.6 keV. pi pi pi
Ba137
Cs137
HCl
-
pi pi Compton 661.6 keV.
3. ( ) pi pi pipi t, pipi pi multi channel scaling menu
mode.
4. menu settings pi MCS. dwell time 1sec. 5. pi pi pi.
Bg.Buffer transfer. 6. pi
a pi o . H pi , pi pi pi pi .
7. pi Ba pi pi . ,
. pi ~30min pi pi.
8. pi Bg subtract (pi pi pi) binary file (*.ssf) tab separated
text (*.tsv).
9. pi pi
.
10. pi pi .
11. menu mode pi pulse height pi .
pi
1. pi pi pi pi . pi.
) pi pi ,
pi ,
. pi
pipi pipi .
) , pi pi pi pi , pi pi
pi .
pi , 1/sec. pi 8.2 .
) pi pi , pi pi ORIGIN, pi , pi , . pi
pi pi pi Bam137
-
(editor) pi notepad. pi - *.asc.
2. pi pi . pi .
3. pi pi Bam137 pi, pi 137Cs 5Ci. pi Ba.
4. pi pi (137Cs - Bam137 ), pi Bam137 , pi
pi pi pi
pi pi.
