Multiple Choice

Multiple Choice

Multiple Choice
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1		Select the nuclide that completes the following nuclear reaction.
			A)
			B)
			C)
			D)
			E)


2		For the average person the source of the greatest amount of radiation per year is:
			A)	radon gas
			B)	x-rays
			C)	cosmic rays
			D)	potassium-40


3		The difference between the rad and the rem is
			A)	the rem is a rad per year
			B)	the rem takes into account the type of radiation
			C)	the rem takes into account the effect on the particular biological tissue
			D)	the rem is 10⁶ rad


4		Fusion reactors have the advantage of
			A)	cheap fuel
			B)	low temperatures
			C)	little radioactive waste
			D)	A and B
			E)	A and C


5		Select the nuclide that completes the following nuclear reaction.
			A)
			B)
			C)
			D)
			E)


6		The half-life of tritium is 12.5 years. How long does it take for the radioactivity due to tritium in a sample decay to 20 percent of its original value?
			A)	29.0 years
			B)	25.0 years
			C)	128 years
			D)	33.3 years
			E)	100 years


7		Which of the following statements is incorrect?
			A)	Alpha particles emitted by a source outside of the human body do not affect internal organs.
			B)	Beta particles cannot penetrate ordinary light clothing.
			C)	Gamma rays can penetrate deeply into living tissue.
			D)	Alpha particles emitted by a source inside the human body can cause significant damage to internal organs.
			E)	Positrons can penetrate ordinary light clothing.


8		The half-life of Sr-90 is 29 years. What fraction of the atoms in a sample would remain 100 years later?
			A)	0.166
			B)	0.092
			C)	0.062
			D)	0.024
			E)	0.50


9		All of the following isotopes should be unstable except:
			A)
			B)
			C)
			D)
			E)


10		Potassium-40 is 0.001% of naturally occurring potassium. It has a half life of 1 x 10⁹ years? How many years would be required to reduce it to the ppm level?
			A)	1 x 10⁹ yr
			B)	3 x 10⁹ yr
			C)	1 x 10¹⁰ yr
			D)	3 x 10¹⁰ yr


11		Which of the following materials is put into a nuclear reactor to slow the chain reaction?
			A)	reflectors
			B)	control rods
			C)	moderators
			D)	heavy water


12		Which of the following is the least penetrating of the three types of nuclear radiation?
			A)	alpha
			B)	beta
			C)	gamma

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