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Exam 10: Radioactivity and Nuclear Processes

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Question 1

True/False

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A wooden box found in an Egyptian tomb could have its age determined using carbon-14.

A) True
B) False

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Question 2

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Free radicals are dangerous because

A) they are found incorporated in any radioisotope,including those that can enter the body through the lungs as does radon
B) they can be taken into the body in the food eaten if that food has been grown in radioactive soil
C) they are substances that are missing some electrons and are extremely active chemically
D) All of these responses are correct.

E) None of the above
F) All of the above

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Question 3

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Carbon-14 is only effective in dating an object up to approximately 10 half-lives.The reason is that the speed with which C-14 decays increases after 10 half-lives.

The gray is one of several units used in association with the biological impact of radiation exposure.

A patient undergoes external irradiation with Co-60 for treatment of cancer.Which of the following would you NOT expect to observe as a result of this type of treatment?

Which of the following is not attracted or repelled by electrical charges?

Extensive use of an MRI should be avoided as it is a source of significant nuclear radiation exposure.

The curie,becquerel and roentgen are all physical units of radiation.

Which of the following are made up of particles identical to electrons?

The number of neutrons in the nucleus of the isotope is _____ .

In nuclear reactions,the principle change occurs in the ______.

The intensity of radiation is 100 units 15 feet from the source.The intensity would then be 300 units 5 feet from the source.

Which of the following types of radiation is composed of particles which carry a negative charge?

The reasons why I-131 is not suitable for use as a tracer are the same reasons why I-131 is an appropriate choice to treat thyroid cancer.

Why is radiation so harmful to living things?

What is the nature of the reactions that occur in a star?

The radioisotope radon-222 is a gas that is a health hazard because it can make its way into the house from the soil in which it is produced,be inhaled,and cause lung cancer.

Which measure of radiation is used to account for health differences of various types of radiation?

Nuclear power plants have control rods that absorb neutrons to control the reaction.What is the composition of the control rods?

The intensity of a radiation source was measured by a Geiger-Müller counter to be 236 counts per minute when the counter was place 124 ft from the source.What will be the intensity when the counter is 248 ft from the source?