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|  RADIOLOGICAL FUNDAMENTALS
DOE-HDBK-1079-94
Tritium Primer
100
50
25
12.5
6.25
3.12
0
1
2
3
4
5
Time (half-lives)
Figure 7 Half-life example
where:
Ao
=
the initial activity (Ci)
At
=
activity after elapsed time, t (Ci)
n
=
number of half-lives during elapsed time, equal to t/T1/2 , where
t
=
elapsed time (time units)
T1/2
=
half-life (time units).
For example, assume we have stored 10,000 Ci of tritium. How many curies will be left after
50 years of storage?
Ao
= 10,000 Ci
n
= 50/12.43 = 4.02
= Ao (1/2)n
At
= 10,000 (1/2)4.02
At
= 10,000 0.062
= 620 Ci (approximately)
Tritium
Page 10
Rev. 0
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