1. Aug 14, 2014

TauDay

1. The problem statement, all variables and given/known data

Two pure manganese foils are irradiated in a reactor. Each foil has a mass of
0.0055 g. One foil is irradiated bare in the reactor. The other foil is irradiated with a
cadmium cover in place. The foils are irradiated for 60.0-s, and then allowed to decay for
1800.0-s prior to counting. The activity of the bare and Cd-covered foils, corrected for
detector efficiency and corrected to the end-of-irradiation (EOI) time, are 1.49 x 107 Bq and
2.34 x 106 Bq, respectively. Figure 1 contains an excerpt from the Chart of the Nuclides
which may contain data useful for completing this problem.

Based on the measured results and the data provided, determine the following:
a. (5 min) The saturation activity of each foil (in Bq).
b. (5 min) The epithermal neutron flux (in n/cm2-s) in this reactor position.
c. (5 min) The 2200-m/s neutron flux (in n/cm2-s) in this reactor position.
d. (5 min) The Cd ratio for this position in the core.

2. Relevant equations

$$\dot{N} = N \sigma \phi - λN = 0 → A_{sat} = N \sigma \phi$$

3. The attempt at a solution

see attachment

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2. Aug 20, 2014