What Kind of Radiation Does the GM Counter Detect?

In summary, the conversation discusses the effects of different materials and distances on the count rate of a radioactive source in front of a GM counter. When the counter is moved 5 cm away from the source, the count rate drops significantly, indicating the presence of alpha and beta radiation. The insertion of a 5mm aluminum sheet between the source and counter further decreases the count rate, suggesting the presence of beta particles. However, the use of a magnet does not significantly affect the count rate, leading to a contradiction as to what kind of radiation is emitted.
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Homework Statement


There is a radioactive source plaed in front of the GM counter to predict the kind of radiation emmitted by the source.
1 : When the GM counter moves 5 cm away from the source, the count rate drops significantly.
2 : When a 5mm aluminium sheet is inserted between, the count ate drops from 100 to 50 coiounts per second.
3 : When a magnet is used, the count rate doesn't drop significantly.

The Attempt at a Solution


I think it will be emitting alpha and beta radiation.
As alpha only has a few centimeters range in air, when it is moved away fro 5 cm, the rate drops significantly.
Also, beta radiation is also emiited, as when 5mm aluminium is used, it drops from 100 to 50 counts per second, so it indicates that beta particles are blocked.
However, I am not sure what is use of condition 3. As if a magnet is used,if it really emits alpha and beta as I mentioned above, it will be deflected by the magnetic field so the count rate should drop significantly but the case is not.
Ok, if let say gamma radiation is emmitted with no beta, the gamma radiation will not be blocked by the 5mm aluminium.it should remain 100 counts per second. And that's why I think there is a contradiction here.
So, what kind of radiation is emmited??
And why when a magnet is used, the count rate doesn't decrease??
Thanks!
 
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  • #2
Depending on the energy of the gamma ray 5mm of aluminum could reduce the count rate by 50%. Also when you move 5cm away from the source which is initially next to the detector the inverse square law has a substantial affect.
 

1. What is a GM Counter and how does it detect radiation?

A GM Counter, also known as a Geiger-Muller Counter, is a device used to detect and measure ionizing radiation. It works by using a gas-filled tube that becomes ionized when radiation passes through it, causing a pulse of electrical current that can be counted and measured.

2. What types of radiation can a GM Counter detect?

A GM Counter can detect various types of ionizing radiation, including alpha particles, beta particles, and gamma rays. It can also detect some types of X-rays, but not all.

3. What is meant by "Radiation Type Emitted" in the context of a GM Counter?

"Radiation Type Emitted" refers to the type of ionizing radiation that is being emitted or given off by a radioactive source. This information is important for understanding the potential health effects and safety precautions that need to be taken.

4. What is the significance of the term "Urgent Q" in relation to GM Counters?

The term "Urgent Q" is used to indicate that the radiation being emitted by a source is of a high level and requires immediate attention. This could indicate a potential health hazard or a hazardous situation that needs to be addressed promptly.

5. How is the measurement of radiation type emitted important in scientific research?

The measurement of radiation type emitted is important in scientific research because it helps to identify and classify different types of radioactive materials. This information can then be used to better understand the properties and behavior of these materials, as well as to develop safety protocols and regulations for handling them.

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