What is thorium 229 used for?
What is thorium 229 used for?
Thorium-229 is one of the most stable radioactive isotopes of thorium. It is currently used in cancer research.
What is the specific activity of Cs 137?
Specific activity of Cs-137 is 3.2 10^12 Bq/g.
What is specific activity of radioisotope?
Specific activity is the activity per quantity of a radionuclide and is a physical property of that radionuclide. The becquerel (Bq) is defined as the number of radioactive transformations per second that occur in a particular radionuclide.
What is the daughter isotope of thorium 230?
List of isotopes
| Nuclide | Z | Daughter isotope |
|---|---|---|
| Excitation energy | ||
| 229Th | 90 | 225Ra |
| 229mTh | 8.3(2) eV | 229Th |
| 230Th | 90 | 226Ra |
What is the symbol of thorium?
Th
Thorium/Symbol
Is thorium named after Thor?
In 1815, for example, Berzelius isolated a new element from a mineral sent to him from the Swedish mining town of Falun and named it thorium after the Scandinavian god of thunder, Thor.
What is the formula of activity?
The SI unit for activity is one decay per second and is given the name becquerel (Bq) in honor of the discoverer of radioactivity. That is, 1 Bq = 1 decay/s. Activity R is often expressed in other units, such as decays per minute or decays per year. 1 MBq = 100 microcuries (µCi).
Why is specific activity important?
Specific activity is an important measure of enzyme purity and values for different batches of a pure enzyme should be the same, within normal experimental error. Batches that are below the expected specific activity value may contain impurities or enzyme molecules that have become denatured.
Is Sulfur 32 stable or radioactive?
Isotopes of sulfur
| Isotope | Decay | |
|---|---|---|
| abundance | mode | |
| 32S | 94.99% | stable |
| 33S | 0.75% | stable |
| 34S | 4.25% | stable |
When to use specific activity and enzyme activity units?
Specific activity is also good for comparing preparations of the same enzyme. But it’s important that you use the same conditions. Unlike with chemistry gas law stuff where we have really strict “standard conditions” called standard temperature and pressure (STP): 0°C & 1 atm.
How to report on the goodness of an enzyme?
One way we can report on an enzyme’s goodness is the enzyme activity unit, or simply unit, which gets abbreviated as a capital U.
Which is dependent on the enzyme unit definition?
Although specific activity is very different from activity, the calculation of specific activity nonetheless is dependent on the activity value, and therefore the stated specific activity value will also be dependent on the enzyme unit definition.
How are the activities of enzymes related to each other?
Since activity relates to concentration it follows that two vials of enzyme can contain the same number of units (in total) but have different activities (concentrations). What Is Specific Enzyme Activity?