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96 ATOMLAB 500 DOSE CALIBRATOR
Formula for Calculating Half Life
d = measurement
d start = starting measurement
d end = ending measurement
calculate Half Life = log 10 (2.0) x d time
log 10 (d start/d end)
Example for F-18:
starting measurement: 4122
ending measurement: 3860
counting time: 10 min
calculate Half Life = log 10 (2.0) x 10 min
log 10 (4122 / 3860)
= 3.0103 min
0.0285207
= 105.54796 min / 60
calculate Half Life = 1.759 hr
Variance Formula
Half Life Variance = calculated Half Life – isotope Half Life
Isotope Half Life
Example for F-18:
Half Life Variance = 1.76 – 1.83
1.83
Half Life Variance = 3.8% lower
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