# Feb 2017 Energy Efficiency Calculations

## Theoretical Activities

Below are the calculations for the theoretical decay frequencies

Na-22, 10.19 uCi on July 15, 2013, half life 2.602 +/- 0.002 years, 99.937% for 1274.52 keV line and 178.8 for 511 keV line , activity in Feb 4, 2017 = 3.947 uCi

= for the 1274 keV line
= for the 511 keV line

Cs-137, 661.660 keV line, 9.067 uCi on May 5, 2005, half life 30.0 +/- 0.2 yrs, February 4, 2017 activity =6.917 uCi expected rate for 661 keV line

=

Mn-54, 9.882 uCi on August 8, 2012, half life =312.20 +/- 0.07 days, 99.975% intensity on 834.826 keV line , February 12, 2017 activity =0.249 uCi

= for the 834 keV line

Co-60, 9.080 uCi July 15, 2013, half life 5.271 +/- 0.001 years, 99.0 % for 1173.237 keV line and 99.9824 % for 1332.501 keV line, February 4, 2016 activity= 5.68 uCi

= for the 1173 keV line

= for the 1332 keV line

Ba-133, 9.821 uCi on April 15, 2007, half life is 10.51 years, the 81 keV line has an intensity of 0.329 and the 356 keV line has an intensity of 0.6205. The activity of February 9, 2017 is 5.15 uCi

= for the 81 keV line
= for the 356 keV line

# Runlist

Below is a table where the actual efficiency will be calculated for position R (farthest position).

 Run Source Energy (keV) Expected Rate (Hz) HpGe Rate (Hz) HpGe Det D Efficiency (%) r5820 Na-22 511 79122.6 (506:516) (4.309-0.065=4.244) 0.005 r5818 Cs-137 661.657 28091.2 (657:666)(1.105-0.02281=1.0821) 0.004 r5896 Mn-54 834.848 861.1 (830:839)(0.04037-0.009123=0.031247) 0.004 r5822 Co-60 1173.228 137692 (1164:1182)(3.686-0.01939=3.67) 0.003 r5820 Na-22 1274.537 44224 (1270:1279) (1.073-0.0057=1.0673) 0.002 r5822 Co-60 1332.492 139058.52 (1328:1337)(3.283-0.05702=3.22598) 0.002