Technetium-99m activity: read the half-life

An example figure from the Half-Life Graph generator.

Activity of technetium-99m in becquerels from 800 Bq against time in hours, with dashed guide lines from 400 and 200 Bq and blank lines by the time axis — The activity of a technetium-99m sample, the medical tracer, falling from 800 Bq, against time in hours. Dashed guide lines run from 400 Bq and 200 Bq across to the curve and down to the time axis, each with a blank line for students to write the time, one and two half-lives.

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Answer key

Technetium-99m: half-life 6.01 hours, λ = 0.115 per hour; gamma emission to technetium-99
After 1 half-life (6.01 hours): 400 Bq
After 2 half-lives (12.02 hours): 200 Bq

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