Table of Nuclides Frequently Asked Questions |

2.1: Decay Data |

Decay Constant |

I have read of a "decay constant" in regard to radioactive decay. What is the "decay constant" of Potassium-40? |

The decay of radioactivity by time is governed by
A(t)=A(0) exp(-lambda t) where lambda = decay constant. The half life it the time at which the radioactivity become half. exp(-lambda T) = 0.5 Then, T = ln(2) / lambda K-40 half life is 1.277x10^9 year. So lambda = 0.5428x10^-9 year^-1 |

**2. Table of Nuclides**- 2.1. Decay Data
- 170Yb decay mode
- Binding energy
- Meta Stable State
- Complete Table of Decay Data
- Decay Constant
- Electron Capture and Beta-plus Decay
- Error in He-6
- Tc-99m
- 85Y gamma intensity
- 79Se
- Rh-102
- Nuclide Chart half-life in MEV?
- Half life of U-235
- Lr-257 and Se-82
- Unit of Intensity
- n-0
- Half-life of Th-229
- Be-5
- Decay heat (137Cs decay)
- Half-life of Ag-108m

- 2.2. Integral Cross Section
- 2.3. Chart of Nuclides
- 2.4. Beta Specrtum
- 2.5. Others

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