What is the unit of measure for decay constant?

The activity of a sample is the average number of disintegrations per second its unit is the becquerel (Bq). The decay constant l is the probability that a nucleus will decay per second so its unit is s-1. The half life is the time for half the nuclei to decay. read more

The proper unit for decay is neper per second, the time it takes radiation to decay by 1/e. In practice, they use halflife, the time it goes from 1 to 1/2. The unit of activity is the bequeral = 1 decay per second, this displaced the curie, being that decay which causes 1 franklin per cc air in 1 second, rated at 37 gigaBq. read more

The units of the decay constant are s −1 [citation needed]. Derivation of the mean lifetime Given an assembly of elements, the number of which decreases ultimately to zero, the mean lifetime, , (also called simply the lifetime) is the expected value of the amount of time before an object is removed from the assembly. read more