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10
200
400
600
800
1000
1200
1400
1600
1800
b
"(-Ray energy (keV)
Fig. 8.1
a,b
y-Ray spectrum of NBS SRM 1566
(oyster tissue) for brief irradiation; upper spectrum - activation with total neutron spectrum, t1 - 1
h, tw =
6
days, and te
= 3600
s; lower spectrum - activation with epithermal neutrons; ti
= 1
h,
1w
= 2
h; and te 3600
s (t
i = irradiation time; tw
= waiting time; and tc
= counting time); 24Na_pp =
24Na gamma-ray pair peak.
by-Ray spectrum of NBS SRM 1566
(oyster tissue) for prolonged irradiation; upper spectrum - activation
with total neutron spectrum; ti
= 48
h;
1w
= 50
days; and t3
= 7200
s; lower spectrum - activation with epithermal neutrons, ti
= 48
h;
1w
= 15
days; te
= 7200
s
(from [558]).
~
~
eO>
- 00
"