From: Alan Sondheim <sondheim@panix.com>
To: _arc.hive_@lm.va.com.au
Subject: Confusion
Date: Sat, 25 Oct 2003 12:41:12 -0400 (EDT)




Confusion


It can be shown by straightforward substitution that the curves of parent
and daughter activity cross at the exact time that the daughter activity
is a maximum. [...] Parent Activity A1. Daughter Activity, A2.

I. Fast Daughter, L2 = 10L1, T2 = T1/10
II. Slow Daughter, L2 = .5L1, T2 = 2T1

The first daughter, Th, will grow into secular equilibrium with the U
within a matter of days. This is illustrated by the "fast-daughter" (type
I) curve of problem 9. After a few days we may consider the Th activity
equal to the U activity, and go on to consider how the Pa grows in.

(Above from Nuclear Physics, 1949-51, A Course Given by Enrico Fermi.)


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