What is the specific activity of radium 226?
1
For example, the specific activity of Ra-226 is 1, meaning that one gram of Ra-226 contains one (1) curie (assumed to be uniformly distributed throughout that mass). It also means that there are 37,000,000,000 Ra-226 atoms disintegrating every second in a gram of Ra-226.
What is the specific activity of U 238?
Uranium
| U-234 | U-238 | |
|---|---|---|
| half-life | 244,500 years | 4.468 · 109 years |
| specific activity | 231.3 MBq/g | 12,445 Bq/g |
What is the specific activity of radium?
This, when combined with Mann’s recent calorimetric measurements on the heating effects in several national primary radium standards prepared by Hönigschmid, gives a value for the specific activity of radium of 3·655 × 1010 disintegrations per second per gram, corresponding to a disintegration constant of 4·326 × 10−4/ …
What is the specific activity of natural uranium?
Specific Activity (Bq mg-1) The activity concentration arising solely from the decay of the uranium isotopes (U-234, U-235 and U-238) found in natural uranium is 25.4 Bq per mg.
Is specific activity constant?
Specific activity is a measure of enzyme processivity (the capability of enzyme to be processed), at a specific (usually saturating) substrate concentration, and is usually constant for a pure enzyme.
What does RA 228 decay into?
Radium-228 and Ra-224 are part of the thorium decay series. All isotopes of radium are radioactive. Radium decays to produce radon gas.
How do you calculate specific activity?
In summary, specific activity = enzyme units / (vol. in µl x (protein conc. in mg per ml / 1000))
How is specific activity calculated?
As specific activity is units of enzyme per mg protein, first calculate the mg protein in the sample. The sample volumes are in µl, whereas the protein concentration is in mg/ml, so you need to divide the latter by 1000 to get mg/µl. In summary, specific activity = enzyme units / (vol. in µl x (protein conc.
Why is U-235 better than U 238?
U- 235 is a fissile isotope, meaning that it can split into smaller molecules when a lower-energy neutron is fired at it. U- 238 is a fissionable isotope, meaning that it can undergo nuclear fission, but the neutrons fired at it would need much more energy in order for fission to take place.
What does specific activity tell you?
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.