Aug 3, 2020 · Secular equilibrium can occur in a radioactive decay chain only if the half-life of the daughter radionuclide B is much shorter than the half-life of the parent radionuclide A.

Two conditions are necessary for secular equilibrium. First, the parent radionuclide must have a half-life much longer than that of any other radionuclide in the series. Second, a sufficiently long period of …

Mar 9, 2009 · A radioactive needle contains 222 Rn (t1/2=3.83 d) in secular equilibrium with 226 Ra (t1/2=1600 a). How long does is it required for 222 Rn to decay to half of its original activity?

Aug 10, 2008 · Homework Statement What mass of Po-212 (T1/2=0.16sec) is in secular equilibrium with Th-232 (T1/2=1.41 x10^10years)? Using A (r)=232.04g.mol-1 for Th-232...

Jun 6, 2020 · It's due to the phenomenon called Secular Equilibrium: After enough time, each intermediate decay-chain product accumulates to an equilibrium concentration, such that the element …

Nov 11, 2025 · I Thread startercrick Start dateJul 2, 2018 Activity Decay Equilibirium Equilibrium Isotope Nuclear Radioactive Jul 2, 2018 #1 crick 43 4

Jun 19, 2018 · Usually, Ba-137m is used in secular equilibrium with its mother Cs-137. Cs-137 has a longer half-life of $30.1671\ \mathrm a$, which makes the handling of samples much easier.

Sep 9, 2016 · Therefore, it is pretty safe to assume that all of the isotopes are in "secular equilibrium". In this case, the activities of all the isotopes are the same. This means the activity of Rn-22 is equal to …

Oct 25, 2022 · The problem is that the concatenation of these two processes leads to a process that is no longer Poissonian (in fact it should follow an Erlang-2 distribution), and hence the time …

Oct 11, 2024 · 0 I am working on problem 10 (a) in the 3rd edition of Goldstein's Classical Mechanics: Three equal mass points have equilibrium positions at the vertices of an equilateral triangle. They are …