Secondary radiation from alpha particles?

In summary: I'm not aware of any materials that generate x-rays as a by-product of alpha particle absorption. However, I'm not entirely sure that x-rays are actually the primary radiation emitted from alpha particles. It's possible that another type of radiation is released.
  • #1
sphere3
2
0
This is probably a naive question, but I've been trying for awhile to figure it out myself and just don't have the background to do so. I know that beta particles can generate x-rays through bremsstrahlung processes, and that some materials excited by alpha particles can generate light through subsequent electron relaxation, such as Zinc Sulfide. I also know that alpha particles can eject neutrons from lightweight materials, like beryllium. However, I was curious about whether alpha particles of ordinary velocity (e.g. 5.5MeV) can induce high energy emanations (such as x-rays or gamma rays) through some process I'm not aware of from different types of materials (e.g. ordinary air vs. aluminum vs. steel vs. silicon) that they bombard. I'm not very familiar with the energy that is emitted when ions recombine or when electrons jump between shells (except for visible light), but I'm guessing those processes would be the sources of most "secondary radiation" from alpha particles. The thing that got me thinking about these possibilities was pondering the construction of smoke detectors that have alpha particles hitting air and whatever metal they use for shielding, and even silicon computer processors that experience periodic alpha particle bombardment from their packaging. I know all that energy from the alpha particles has to go somewhere, and wonder if any of it ends up as high-energy rays. Thanks!
 
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  • #2
The interaction of alpha particles with Be nucleus is a special case. For other nuclei, the alphas scatter or ionize atoms. Those atoms remove atomic electrons as they slowdown. As electrons recombine with atoms, they release photons which are characteristic of the energy levels in those atoms which are in the range of IR, visible, UV and low energy X-ray.

I'm not aware that silicon computer processors experience bombardment from their packaging. Alpha emitters are heavy elements Po on up.
 
  • #3
Astronuc said:
...I'm not aware that silicon computer processors experience bombardment from their packaging...

"In the early days" radiation was a problem (random, non-recurring errors). It turned out to be from the packaging. As I recall, it was only the ceramic packages.

Sorry, no references.

Neil
 
  • #4
I know that some Si was 'doped' by neutron irradiation, but I believe that was Si logs loaded in a neutron source, e.g. a small nuclear reactor. Perhaps the Si became contaminated(?) by ballistic mixing with neutron activated capsule material (?).

Light elements (Bi and below) undergo beta decay (with some gamma emission), positron emission, or electron capture.
 
  • #5
captn said:
"In the early days" radiation was a problem (random, non-recurring errors). It turned out to be from the packaging. As I recall, it was only the ceramic packages.

Maybe the packaging was made from Fiesta Ware. :biggrin:
 
  • #6
jtbell said:
Maybe the packaging was made from Fiesta Ware. :biggrin:

That's not too far from the truth. There are trace amounts of uranium and especially thorium pretty much everywhere, unless you take steps to prevent it. Likewise with lead-210, if its been near anywhere with radon.

People who do experiments requiring radiopurity have to work quite hard to keep these isotopes away.
 
  • #7
Very interesting! In the references I read on alpha particle shielding they didn't mention the possibility of any shielding materials generating x-rays as a by-product of alpha particle "absorption." Do you think that's just because the amount of alpha particle energy converted to x-rays is too low-level to pose any danger?
 

FAQ: Secondary radiation from alpha particles?

What is secondary radiation from alpha particles?

Secondary radiation from alpha particles refers to the radiation that is produced when alpha particles interact with matter. This radiation can include gamma rays, beta particles, and other particles that are created as a result of the initial interaction.

How is secondary radiation from alpha particles produced?

Secondary radiation from alpha particles is produced through a process called ionization. When an alpha particle collides with an atom, it can knock off electrons and create charged particles. These charged particles can then interact with other atoms, producing secondary radiation.

What are the potential effects of secondary radiation from alpha particles?

The effects of secondary radiation from alpha particles depend on the type and amount of radiation produced. Exposure to high levels of secondary radiation can damage cells and DNA, leading to health issues such as cancer. However, the risk of these effects is generally low for most people.

How can secondary radiation from alpha particles be detected?

Secondary radiation from alpha particles can be detected using specialized equipment such as Geiger counters or scintillation detectors. These devices can measure the amount and type of radiation present in a given area. Additionally, scientists can also use dosimeters to measure a person's exposure to secondary radiation.

How can we protect ourselves from secondary radiation from alpha particles?

To protect ourselves from secondary radiation from alpha particles, we can use various safety measures such as shielding and distance. Shielding involves using materials such as lead or concrete to block the radiation, while distance refers to staying a safe distance away from a source of radiation. Additionally, following proper safety protocols and regulations can also help minimize exposure to secondary radiation.

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