## What is the decay equation for iodine 131?

Iodine-131 is a beta emitter commonly used in nuclear medicine. The equation for its decay is: Note that both the charge and the mass are balanced and that iodine-131 emits both a gamma ray and a beta particle….

Radiation emitted | Change in Atomic number | Change in Mass number |
---|---|---|

gamma ray | 0 | 0 |

**What is the beta decay of iodine 131?**

As an example, iodine-131 is a radioisotope with a half-life of 8 days. It decays by beta particle emission into xenon-131….10.3: Half-Life.

Nuclide | Half-Life (t1/2) | Decay Mode |
---|---|---|

Cobalt-60 | 5.27 years | β− |

Francium-220 | 27.5 seconds | α |

Hydrogen-3 | 12.26 years | β− |

Iodine-131 | 8.07 days | β− |

**What is the beta decay of cesium-137?**

barium-137

Caesium-137 is a man-made radioactive isotope with a half-life of 32 years. It decays via β decay into barium-137. Of these decays 94.6 % lead to a metastable excited state of barium, Ba-137m, which passes into the ground state with a half-life of 156 s, whereby a γ quantum of 661.6 keV is emitted.

### What is the nuclear decay equation?

Average number of radioactive decays per unit time (rate) • or – Change in number of radioactive nuclei present: A = -dN/dt • Depends on number of nuclei present (N). During decay of a given sample, A will decrease with time.

**How do you calculate decay activity?**

One of the applications of radioactive decay is radioactive dating, in which the age of a material is determined by the amount of radioactive decay that occurs. The rate of decay is called the activity R: R=ΔNΔt. The SI unit for R is the becquerel (Bq), defined by 1Bq=1decay/s.

**How do you calculate atomic decay?**

Radioactive decay law: N = N.e-λt The rate of nuclear decay is also measured in terms of half-lives. The half-life is the amount of time it takes for a given isotope to lose half of its radioactivity. If a radioisotope has a half-life of 14 days, half of its atoms will have decayed within 14 days.