Hours to decay constant per second
Type a value in h to get it in λ (1/s) instantly.
3.36×10⁻⁸λ (1/s)
That's 30× as long-lived as iodine-131, while cesium-137 is 46× longer. Only one percent would be left after about 4.343 years.
What it means
How long does it last?
Half-life is a property of the nucleus alone. Heat, pressure and chemistry do not change it, which is what makes radiometric dating work.
The math
How to convert h to λ (1/s)
The three describe the same decay: λ = 0.693 ÷ half-life, and mean lifetime = half-life ÷ 0.693. The 0.693 is the natural logarithm of 2.
Example: 5,730 h = 3.36×10⁻⁸ λ (1/s).
Every unit
Your half-life in every unit
Tables
h to λ (1/s) conversion table
| h | λ (1/s) |
|---|---|
| 1 h | 0.000192541 λ (1/s) |
| 60 h | 3.209×10⁻⁶ λ (1/s) |
| 3,600 h | 5.348×10⁻⁸ λ (1/s) |
| 86,400 h | 2.228×10⁻⁹ λ (1/s) |
| 1,000,000 h | 1.925×10⁻¹⁰ λ (1/s) |
| 100,000,000 h | 1.925×10⁻¹² λ (1/s) |
| 1×10¹⁰ h | 1.925×10⁻¹⁴ λ (1/s) |
| 1.8×10¹¹ h | 1.07×10⁻¹⁵ λ (1/s) |
| 1.4×10¹⁷ h | 1.375×10⁻²¹ λ (1/s) |
λ (1/s) to h conversion table
| λ (1/s) | h |
|---|---|
| 1 λ (1/s) | 0.000192541 h |
| 60 λ (1/s) | 3.209×10⁻⁶ h |
| 3,600 λ (1/s) | 5.348×10⁻⁸ h |
| 86,400 λ (1/s) | 2.228×10⁻⁹ h |
| 1,000,000 λ (1/s) | 1.925×10⁻¹⁰ h |
| 100,000,000 λ (1/s) | 1.925×10⁻¹² h |
| 1×10¹⁰ λ (1/s) | 1.925×10⁻¹⁴ h |
| 1.8×10¹¹ λ (1/s) | 1.07×10⁻¹⁵ h |
| 1.4×10¹⁷ λ (1/s) | 1.375×10⁻²¹ h |
Quick answers
Quick answers
- How many λ (1/s) is 1 h?
- 1 h is 0.000192541 λ (1/s).
- How many λ (1/s) is 10 h?
- 10 h is 1.925×10⁻⁵ λ (1/s).
- How many λ (1/s) is 5,730 h?
- 5,730 h is 3.36×10⁻⁸ λ (1/s).
The units
About these units
Hours (h)
Technetium-99m, the workhorse of nuclear medicine, sits here at 6 hours.
Decay constant per second (λ (1/s))
The chance per second that any one atom decays.
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