What is the decay mode of iodine?
Iodine-131 has a half-life of 8.06 days and decays by beta-particle emission to a stable 131Xe. The principal mean beta energy (90%) is 192 keV. Several gamma rays are also emitted, and the predominant photon is 364 keV (82% abundance) (HVL in water of 6.4 cm).
What type of decay does iodine 125 undergo?
gamma decay
Its half-life is 59.49 days and it decays by electron capture to an excited state of tellurium-125. This state is not the metastable 125mTe, but rather a lower energy state that decays immediately by gamma decay with a maximum energy of 35 keV.
What is the decay equation for iodine 123?
The isotope’s half-life is 13.22 hours; the decay by electron capture to tellurium-123 emits gamma radiation with a predominant energy of 159 keV (this is the gamma primarily used for imaging)….Iodine-123.
| General | |
|---|---|
| Half-life | 13.22 h |
| Parent isotopes | 123Xe |
| Decay products | 123Te |
| Isotope mass | 122.905589(4) u |
What type of decay does iodine 134 undergo?
List of isotopes
| Nuclide | Z | Decay mode |
|---|---|---|
| Excitation energy | ||
| 134I | 53 | β− |
| 134mI | 316.49(22) keV | IT (97.7%) |
| β− (2.3%) |
What is iodine-131 Halflife?
Radioactive Iodine The 131I isotope has a half-life of 8 days and emits γ radiation and β particles. Given orally, it is concentrated in the thyroid, where the β particles destroy the gland.
What is the difference between I-131 and I 125?
Iodine-125 is used as a cancer therapeutic, and as a brain, blood, and metabolic function diagnostic. Iodine-131 is used as a brain, pulmonary, and thyroid diagnostic.
How long does iodine-125 take to decay?
60 days
Iodine-125 is a commonly used radionuclide with a half-life of 60 days, emitting gamma rays with a maximum energy of 0.035 MeV (Million Electron Volts). See chart below for the decay rate information for I-125.
How is iodine-131 produced?
Iodine-131 is an artificially produced fission by-product resulting from nuclear weapons, above-ground nuclear testing, and nuclear reactor operations. Iodine-131 is found in the gaseous and liquid waste streams of nuclear power plants, but is not released to the environment during normal reactor operations.
What is the difference between I-123 and I-131?
Iodine, in the form of iodide, is made into two radioactive isotopes that are commonly used in patients with thyroid diseases: I-123 (harmless to thyroid cells) and I-131 (destroys thyroid cells. RAI is safe to use in individuals who have had allergic reactions to seafood or X-ray contrast agents.
What is I-123 I 125 used for?
Iodine-125 has been sometimes been used in scanning/imaging the thyroid, but Iodine-123 is preferred for this purpose, due to better radiation penetration and shorter Half Life (13 hours). Airborne plume deposits of radiation contamination on pasture results in contaminated feed ingested by cows.
What is I 125 used for?
Iodine-125 (125I) is a radioisotope of iodine with a half-life of 59.43 days and lower energy, and 125I seed implantation has been successfully used in radiation therapy as brachytherapy to treat a number of types of tumors, including prostate cancer, uveal melanomas, brain tumors, rectal carcinoma,2 advanced …
Why iodine-131 undergoes a decay process?
Iodine-131 undergoes radioactive decay because the mass of its nucleus, the combination of its protons and neutrons, creates an excess of energy that…
What is the half life of iodine 124?
Iodine-124 is a proton-rich isotope of iodine with a half-life of 4.18 days. Its modes of decay are: 74.4% electron capture, 25.6% positron emission. 124I decays to 124Te. Iodine-124 can be made by numereous nuclear reactions via a cyclotron.
How are the isotopes of iodine decayed?
Both isotopes decay by electron capture (EC) to the corresponding tellurium nuclides, but in neither case are these the metastable nuclides 123m Te and 125m Te (which are of higher energy, and are not produced from radioiodine). Instead, the excited tellurium nuclides decay immediately (half-life too short to detect).
What happens when I-131 decays into xe-131?
Upon decaying, I-131 transforms into Xe-131: The primary emissions of I-131 decay are 364 KeV Gamma rays (81% abundance) and Beta particles with a maximal energy of 606 KeV (89% abundance). The Beta particles, due to their high mean energy (190 KeV; 606 Kev is the maximum, but a typical Beta-decay spectrum has a tissue penetration of 0.6 to 2 mm.
What causes the isotope 123m Te to decay?
Abnormal results may be caused by disorders such as Graves’ disease or Hashimoto’s thyroiditis. Both isotopes decay by electron capture (EC) to the corresponding tellurium nuclides, but in neither case are these the metastable nuclides 123m Te and 125m Te (which are of higher energy, and are not produced from radioiodine).