Half-Life Calculator
Calculate radioactive decay and substance half-life
Calculation Parameters
Results
Remaining Quantity
35.36 units
Elapsed Time
15 hours
Decay Constant
0.0693 /hour
Half-Lives Passed
1.5
Decay Formula
N(t) = 100 × (1/2)^(15/10) Decay Visualization
What is Half-Life?
Half-life is the time required for a quantity to reduce to half of its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay.
The half-life concept is also used in various other fields including medicine, chemistry, and environmental science to describe exponential decay processes.
How the Calculation Works
The formula for calculating the remaining quantity of a substance after a given time is:
N(t) = N₀ × (1/2)^(t/T) Where:
N(t) = quantity still remaining after time t
N₀ = initial quantity
t = elapsed time
T = half-life of the substance