Days to decay constant per second
Type a value in d to get it in λ (1/s) instantly.
1.4×10⁻⁹λ (1/s)
That's 714× as long-lived as iodine-131, while cesium-137 is 1.92× longer. Only one percent would be left after about 104.2 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 d 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 d = 1.4×10⁻⁹ λ (1/s).
Every unit
Your half-life in every unit
Tables
d to λ (1/s) conversion table
| d | λ (1/s) |
|---|---|
| 1 d | 8.023×10⁻⁶ λ (1/s) |
| 60 d | 1.337×10⁻⁷ λ (1/s) |
| 3,600 d | 2.228×10⁻⁹ λ (1/s) |
| 86,400 d | 9.285×10⁻¹¹ λ (1/s) |
| 1,000,000 d | 8.023×10⁻¹² λ (1/s) |
| 100,000,000 d | 8.023×10⁻¹⁴ λ (1/s) |
| 1×10¹⁰ d | 8.023×10⁻¹⁶ λ (1/s) |
| 1.8×10¹¹ d | 4.457×10⁻¹⁷ λ (1/s) |
| 1.4×10¹⁷ d | 5.73×10⁻²³ λ (1/s) |
λ (1/s) to d conversion table
| λ (1/s) | d |
|---|---|
| 1 λ (1/s) | 8.023×10⁻⁶ d |
| 60 λ (1/s) | 1.337×10⁻⁷ d |
| 3,600 λ (1/s) | 2.228×10⁻⁹ d |
| 86,400 λ (1/s) | 9.285×10⁻¹¹ d |
| 1,000,000 λ (1/s) | 8.023×10⁻¹² d |
| 100,000,000 λ (1/s) | 8.023×10⁻¹⁴ d |
| 1×10¹⁰ λ (1/s) | 8.023×10⁻¹⁶ d |
| 1.8×10¹¹ λ (1/s) | 4.457×10⁻¹⁷ d |
| 1.4×10¹⁷ λ (1/s) | 5.73×10⁻²³ d |
Quick answers
Quick answers
- How many λ (1/s) is 1 d?
- 1 d is 8.023×10⁻⁶ λ (1/s).
- How many λ (1/s) is 10 d?
- 10 d is 8.023×10⁻⁷ λ (1/s).
- How many λ (1/s) is 5,730 d?
- 5,730 d is 1.4×10⁻⁹ λ (1/s).
The units
About these units
Days (d)
Iodine-131 and most short-term medical isotopes.
Decay constant per second (λ (1/s))
The chance per second that any one atom decays.
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