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Results tagged with radioactivity
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user 123352
The property of some materials by which individual atoms decay, emitting energy or particles often transforming into different elements in the process.
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Is specific radioactive activity constant?
I think it is easier to understand if you write the variables as functions of time. Activity is defined as
$$A(t)=\lambda N(t) =\lambda \frac{m(t) N_a}{M}$$
where $N(t)$ is the number density as a fu …
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Radioactive decay curve
If you have multiple radioactive nuclides, and one nuclide decays into a second one, the overall radioactivity can increase with time. …
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Comparing different radioactive materials
If you read about the effects of tritium, you will find out that the radioactivity effects of tritium are very low to humans. …
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Why doesn't the water in a nuclear reactor become radioactive?
What is the radioactivity of the induced nuclides?
For all of these reactions, the cross section of interaction is low, especially when compared to cross sections in fuel. …
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Radioactivity and half life
The poster may be asking if radioactive decay is a continuous process or a discrete process.
It is a continuous process. For any given increment in time, there is a probability that a certain amount …
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Can beta rays induce radioactivity
"Photofission" is the process of gamma rays causing fission reactions.
"Photoneutrons" are when neutrons are produced from (g,n) reactions, but there is no fission. There are not many isotopes that …
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Accepted
Does the equivalent dose of radiation have the same half-life as the radioactive material?
Yes, assuming it is a single type of radiation source.
The conversion from mass to dose is a constant, so you can multiply both sides of your equation by the same constant.
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How to model radiation from non point sources?
The long answer is that you have to run a neutron transport calculation - either a deterministic method like discrete ordinates method, or a Monte Carlo calculation. The complexity of the problem dep …
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Accepted
Do samples of radioactive materials in vaccum, produce ions and acquire net charges
Note that you are also creating extra protons (Z+1), so the net charge in the system remains the same.
You are creating extra negative electrons, but in a closed system they will recombine with positi …
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Accepted
Why does the product nucleus lose an electron during beta positive decay process?
You are modeling the following reaction:
Nitrogen-13 -> Carbon-13 + Positron + neutrino
This reaction is in the nucleus, so you should use the mass of the nucleus in the mass balance, not the atomic m …
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How much faster does induced fission in a typical reactor occur than spontaneous fission in ...
"Spontaneous fission (SF)" and "fission" usually refer to two completely different processes. SF happens when an atom fissions all by itself. This is very rare. "Fission" occurs then an atom absorb …
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Do all radioactive isotopes and compounds exhibit photoluminesce?
Fluorescence and radioactivity are two completely different things.
Fluorescence usually refers to a material that emits light (or "glows") when exposed to UV light. … Radioactivity is a separate process where a material undergoes radioactive decay. Fluorescence is a chemical property and radioactivity is a property of the nucleus. …
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