How to Calculate Detection Probability of Alpha Particles from a 241Am Source?

In summary: For example, you might know the energy of the alpha particles that will reach the detector, or the area of the detector. Using those two pieces of information, you can calculate the probability.
  • #1
india
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Probability for detection !

I have to calculate the probability of alpha particle or photon being detected by Si detector from the 241Am source. How to know no of alpha that can be detected from the 241Am source ?? source have acticity of 3.7kBq and distance between source and detector is 35mm. as well the area of square detector is 8*8mm2.
 
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  • #2


Consider a sphere with a radius of 35mm - which fraction of the surface area does your detector cover?
If you have air or some other material between source and detector, alpha particles might lose their energy before they reach the detector.
 
  • #3


So there will be the vacuum inbetween source and detector. So there will be very less chance for energy loss of alpha, That can be detected at 35mm distance. Also there is no material in between.
Area of detector is 64mm^2, and distance is 35mm. So i think fraction of surface are covers detector (or fraction of total radiation) can be given by, A/(4pi*R^2)=64/4*pi*34*35 = 0.0042
Am I right ?
and If so, then How to get the probability out of it ?

mfb said:
Consider a sphere with a radius of 35mm - which fraction of the surface area does your detector cover?
If you have air or some other material between source and detector, alpha particles might lose their energy before they reach the detector.
 
  • #4


So there will be the vacuum inbetween source and detector. So there will be very less chance for energy loss of alpha, That can be detected at 35mm distance. Also there is no material in between.
Area of detector is 64mm^2, and distance is 35mm. So i think fraction of surface are covers detector (or fraction of total radiation) can be given by, A/(4pi*R^2)=64/4*pi*34*35 = 0.0042
Am I right ?
and If so, then How to get the probability out of it ?
 
  • #5


If your detector is perfect, that ratio is the probability simply by geometry (and assuming your source emits radiation in all directions with the same intensity, e.g. there is no shielding in the source itself). If it is not perfect, you need additional data about the detector.
 

FAQ: How to Calculate Detection Probability of Alpha Particles from a 241Am Source?

What is probability for detection?

Probability for detection is a statistical concept used to quantify the likelihood of an event or object being detected or observed. It is often used in scientific research and experiments to understand the likelihood of a certain outcome occurring.

How is probability for detection calculated?

Probability for detection is typically calculated by dividing the number of successful detections by the total number of opportunities for detection. This can be represented as a decimal, percentage, or fraction.

What factors influence probability for detection?

There are several factors that can influence the probability for detection, including the sensitivity of the detection method, the size and complexity of the object being detected, and external factors such as environmental conditions and interferences.

How is probability for detection used in scientific research?

Probability for detection is a critical component in many scientific research studies. It is used to determine the significance of results, assess the reliability and accuracy of data, and make predictions about future events or observations.

What are the limitations of using probability for detection?

While probability for detection can provide valuable insights and information, it is important to note that it is not a guarantee of detection. There may be other factors at play that can affect the outcome, and the probability may change over time as conditions and variables change.

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