How do you calculate the half-life of strontium-90?
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How do you calculate the half-life of strontium-90?
For example, the half-life of strontium-90 is 28.8 years. If you start with 10 grams of 90Sr and wait 28.8 years, you’ll have 5 grams left of 90Sr. If another 28.8 years go by, 2.5 grams will remain.
What is the decay equation for for strontium-90?
) is a radioactive isotope of strontium produced by nuclear fission, with a half-life of 28.8 years. It undergoes β− decay into yttrium-90, with a decay energy of 0.546 MeV….Strontium-90.
| General | |
|---|---|
| Beta decay | 0.546 |
| Isotopes of strontium Complete table of nuclides |
What is the half-life of strontium 89?
Strontium-89 (Sr-89) is a pure emitter with maximum beta energy of 1.46 MeV, average beta energy of 0.58 MeV, and a physical half-life of 50.5 days.
What type of decay is strontium-90?
Strontium-90 Beta Decay Natural Strontium (Sr) does not have radioactive properties, but its isotope 90Sr has high radioactive properties and undergoes Beta (β– ray) decay. Its decay energy is 0.546 MeV and is distributed among an anti-neutrino, an electron and the 90Y (Yttrium-90) isotope.
What is the daughter nucleus of the Sr-90 decay?
A quick look in the periodic table will show that strontium has an atomic number of 38 . Another quick look in the periodic table will reveal that the daughter nuclide is yttrium-90, 90Y .
How does strontium 89 decay?
Strontium 89 decays by beta emission to yttrium 89 with a half-life of 50.6 days. The average beta energy is 1.46 MeV. Chemically similar to calcium, strontium 89 is quickly taken up into the mineral matrix of bone.
What is the half-life of samarium 153?
The half-life of samarium-153 is 1.9 days, much shorter than that for the other 2 agents, and results in a more rapid delivery of radiation.
What is the half-life of I 131?
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 half-life math example?
The time taken for half of the original population of radioactive atoms to decay is called the half-life. This relationship between half-life, the time period, t1/2, and the decay constant λ is given by t12=0.693λ t 1 2 = 0.693 λ .
What is the half-life of strontium-89?
Why does strontium-89 have a long half-life?
) is a radioactive isotope of strontium produced by nuclear fission, with a half-life of 50.57 days. It undergoes β− decay into yttrium-89. Strontium-89 has an application in medicine….Strontium-89.
| General | |
|---|---|
| Half-life (t1/2) | 50.57 d |
| Decay products | 89Y |
| Decay modes | |
| Decay mode | Decay energy (MeV) |
How is samarium 153 used?
A radioactive substance used to treat bone cancer and other cancers that have spread to the bone. Samarium Sm 153 is a radioactive form of the element samarium. It collects in bone, where it releases radiation that may kill cancer cells.
What is the half-life of Cs 137?
30 years 70 days
Half Lives
| Isotope | Physical Half-Life | Biological Half-Life |
|---|---|---|
| Cesium (Cs-137) | 30 years | 70 days |
| Cs-134 | 2 years | 70 days |
| Iodine-131 (I-131) | 8.1 days | 138 days |
| Sr-90 | 28 years | 18,000 days |
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 |
How do you find the half-life of parent and daughter atoms?
The blue atoms represent the # of daughter atoms produced after some time t. After a time interval based on the decay rate, 1/2 of the # of atoms of the parent = 1/2 the # of atoms of the daughter. This = the half life.
