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The nuclear scattering cross-sections of neutrons depend most strongly on the neutron's _____.
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1. volume2. area3. charge4. mass5. speed
What energy does a thermal neutron have?
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A neutron is characterized by the term "cold neutron" when _____.
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1. 2302. 2103. 604. 2505. 160
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1. 3.42. 7.93. 5.34. 0.35. 1.9
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1. 192. 263. 304. 95. 3
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1. 3.02. 2.53. 1.04. 5.05. 0.9
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1. 2002. 1,3003. 214. 305. 36
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A principal mechanism for energy loss during nuclear fusion is bremsstrahlung. What is this loss associated with?
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How can one roentgen be defined?
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1. 0.302. 7.33. 8.94. 0.335. 0.37
How can a rem (roentgen equivalent in man) be defined?
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1. the product of the dose in roentgen and the RBE factor
2. the quotient of the dose in rad by energy of radiation
3. the product of the dose in rad and the RBE factor
4. the dose in rad times the dose in roentgen
5. the dose in RBE
Which of the following is not a radiation detector?
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1. spark chamber2. cloud chamber3. control rod4. proportional
counter5. semiconductor-
diode detector
What is the most likely result when a fast neutron collides with a hydrogen or deuterium nucleus?
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1. The neutron has an appreciable loss in kinetic energy, the loss being greatest for head-on collisions.
2. The neutron has an appreciable gain in kinetic energy, the gain being greatest for oblique collisions.
3. The neutron is absorbed by the hydrogen or deuterium nucleus.
4. The neutron has an appreciable gain in kinetic energy, the gain being greatest for head-on collisions.
5. The neutron has an appreciable loss in kinetic energy, the loss being greatest for oblique collisions.
In order to control a nuclear reactor, control rods can be pulled out of or pushed into the reactor core by remote control. These rods control the reactor by _____.
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Radiant energy reaching the Earth from the sun is not sufficient to keep the Earth's surface temperature comfortable for life. What is the most likely source of the additional thermal energy?
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1. 4.72. 383. 0.684. 1.45. 2.33
Radioactive technetium, a gamma emitter, is taken up by the heart muscle in a medical test. What could be the detector for the radiation emitted from the heart?
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1. medical fiberscope2. photoelectric tube3. gyroscope camera4. proportional
counter5. polaroid filter
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1. photon capture2. positron capture3. alpha capture4. electron capture5. neutron emission
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When a nucleus undergoes fission, the two daughter nuclei are generally radioactive. By which process are they most likely to decay?
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Which of the following are possible fission reactions?
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Which of the following has the function of slowing down fast neutrons?
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1. Control rods.2. Moderator.3. Fuel elements.
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1. push the control rods deeper into the core
2. pull the control rods farther out of the core
In the core of a star, hydrogen nuclei combine in fusion reactions. Once the hydrogen has been exhausted, fusion of helium nuclei can occur. Once the helium is used up, if the star is sufficiently massive, fusion of heavier and heavier nuclei can occur. Consider fusion reactions involving two nuclei with the same value of A. For these types of reactions, which of the following values of A are impossible?
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1. 122. 203. 284. 64
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