The table that follows may be used to determine the amount of technetium-99m ( ^99m Tc) remaining in a sample after a given period of time using the following formula: original activity multiplied by the fraction remaining at time T. Time is given in hours and minutes.

The table on the next page may be used to determine the yield of ^99m Tc from a molybdenum-99 ( ⁹⁹ Mo)/ ^99m Tc generator when eluted at a particular time interval after the previous elution.

^99m Tc Decay Chart

Time	Fraction Remaining
0:00	1.000
0:10	0.981
0:20	0.962
0:30	0.944
0:40	0.926
0:50	0.908
1:00	0.891
1:10	0.874
1:20	0.857
1:30	0.841
1:40	0.825
1:50	0.809
2:00	0.794
2:10	0.779
2:20	0.764
2:30	0.749
2:40	0.735
2:50	0.721
3:00	0.707
3:10	0.694
3:20	0.680
3:30	0.667
3:40	0.655
3:50	0.642
4:00	0.630
4:10	0.618
4:20	0.606
4:30	0.595
4:40	0.583
4:50	0.572
5:00	0.561
5:10	0.551
5:20	0.540
5:30	0.530
5:40	0.520
5:50	0.510

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