# Difference between revisions of "LB Feb 2017 Geometric Efficiency Calculations"

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Now compute the expected rate for Feb 12, 2017 | Now compute the expected rate for Feb 12, 2017 | ||

− | The activity on Feb 12, 2017 is | + | The activity on Feb 12, 2017 is 3.924 uCi, so the expected rate for the 2 lines are |

+ | |||

+ | |||

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

## Revision as of 21:37, 16 February 2017

Below are the theoretical 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

Now compute the expected rate for February 5, 2017.

The activity on Feb 5, 2017 is 3.944 uCi, so the expected rates for the 2 lines are

- = for the 1274 keV line

- = for the 511 keV line

Now compute the expected rate for February 9, 2017

The activity on Feb 9, 2017 is 3.933 uCi, so the expected rate for the 2 lines are

- = for the 1274 keV line

- = for the 511 keV line

Now compute the expected rate for Feb 12, 2017

The activity on Feb 12, 2017 is 3.924 uCi, so the expected rate for the 2 lines are

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 (%) |

r5825 | Na-22 | 511 | 79122.6 | (480:540) (4.309-0.065=4.244) | 0.005 |

r5826 | Na-22 | 511 | 28091.2 | (480:540)(1.105-0.02281=1.0821) | 0.004 |

r5827 | Na-22 | 511 | 861.1 | (480:540)(0.04037-0.009123=0.031247) | 0.004 |

r5829 | Na-22 | 511 | 137692 | (480:540)(3.686-0.01939=3.67) | 0.003 |

r5830 | Na-22 | 511 | 44224 | (480:540) (1.073-0.0057=1.0673) | 0.002 |

r5831 | Na-22 | 511 | 139058.52 | (480:540)(3.283-0.05702=3.22598) | 0.002 |