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What is the relationship between distance and radiation intensity from a gamma and a beta source
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Measure radiation Use variables, constants, and controls to
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design your experiment Collect and organize data from gamma and beta radiation activity compared to the distance from the source Compare and contrast beta and gamma radiation activity
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If a Geiger counter is used, keep hands,
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pencils, etc away from the end of the Geiger tube as the tube window is very thin and fragile Plug equipment into only GFCI-protected receptacles to prevent shock hazard Do not eat, drink, or apply makeup when working with radioactive materials Be careful not to crack open the protective plastic case over the radioactive material Inform your teacher immediately if this exposure happens
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gamma and beta sources radiation counter or student radiation monitor meterstick masking tape stopwatch
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Data Table
Background Radiation (cpm counts per minute) Distance (cm) 2 4 6 8 10 12 14 Beta-Measured Count Rate (cpm) Beta-Corrected Count Rate (cpm) Gamma-Measured Count Rate (cpm) cpm Gamma-Corrected Count Rate (cpm)
Procedure
1 The type of radiation counter or Geiger-Mueller tube and counter that is available in schools varies dramatically Your procedure should take into consideration how to assemble and handle the type of equipment that is available for your use both the detector and the radioactive material 2 With the detector at least 1 m away from the radioactive materials, turn on the detector and measure the radiation This is called background radiation Record your data in the data table 3 Measure the beta and gamma radiation from your sources at various distances 4 Subtract the background count rate from the count rate recorded to obtain the corrected activity 5 Be sure to check with your teacher and have your design approved before you proceed with the lab
3 Make and Use Graphs Make a plot of the corrected sample count rate versus 1/d 2 for the beta and gamma data
Conclude and Apply
1 Explain how the two graphs compare What relationship exists between distance and count rate 2 Explain how the background count rate would compare if you were at sea level, such as along the coast, compared to the level in the Rocky Mountains 3 Describe what happens to the beta count rate when the Geiger-Mueller tube is moved back to three times the initial distance; for example, 18 cm as compared to 6 cm
Going Further
What other physics phenomena follow similar patterns
Analyze
1 Observe and Infer What is the background radiation source in this experiment 2 Make and Use Graphs Make a plot of gamma count rate versus distance, placing distance on the horizontal axis and corrected sample count rate on the vertical axis If the count rate levels are similar, plot the beta count rate on the same graph, and label the graph for each set of data
Real-World Physics
Explain how closeness to radioactive materials is a potential hazard for you or others
To find out more about radiation, visit the Web site: physicsppcom
Thermonuclear Fusion
For several decades, physicists have been seeking to create and sustain a fusion reaction that will generate more energy than it consumes A thermonuclear reactor would generate great heat from small amounts of deuterium, 2H, 1 and tritium, 3H, which can be extracted from 1 seawater To initiate a fusion reaction, a mixture of deuterium and tritium must be heated and compressed under conditions typical of those in the Sun The required temperature would destroy the sort of containers used in fission plants Confining the plasma is one of the chief design problems for fusion reactors Magnetic Confinement In a magnetic
confinement reactor, a strong current is passed through a container of deuterium and tritium gas so that the plasma is compressed within the arc Additional magnetic fields shape the plasma stream, as shown in the diagram, confining it away from the container walls One promising configuration keeps the plasma in a toroid, or donut shape, which has the great advantage of having no ends to seal outer layer of the pellet so quickly that it explodes Simultaneously the remainder of the pellet is compressed and heated so greatly that a fusion reaction starts The energy from the fusion of the pellet exceeds the energy used to heat the pellet A stream of pellets is fused one after another to obtain a sustained reaction, and the obtained heat is captured to create steam for turbines
In inertial confinement, beams of light or X rays from a laser rapidly heat the surface of the pellet, forming a surrounding plasma envelope The rest of the fuel is compressed by the blowoff of the hot surface material
The Future While thermonuclear fusion has been sustained in both types of reactors, researchers have had trouble achieving a breakeven reaction (one in which the energy produced in the reaction exceeds the energy needed to sustain the reaction) Progress toward a practical thermonuclear reactor has been expensive and slow, but the promise is great A fusion reactor is not completely free of radiation hazards because neutrons are produced in fusion reactions But because the fuel itself is not radioactive, the amount of nuclear waste would be negligible
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