Question 1

One mCi of a radioactive substance emits more radiation than one μCi of the same substance.

Accepted Answer

A) True 
 B)False  True

Question 2

The nuclear reaction   Sn →   Sb + ? is an example of

Accepted Answer

A) fusion. 
B) fission. 
C) translation. 
D) alpha decay. 
E) beta decay. 
A) fusion. 
B) fission. 
C) translation. 
D) alpha decay. 
E) beta decay. E

Question 3

Iodine-123, which is used for diagnostic imaging in the thyroid, has a half-life of 13 hours. If 50.0 mg of I-123 were prepared at 8:00 a.m. on Monday, how many mg remain at 10:00 a.m. on the following day?

Accepted Answer

A) 50.0 mg 
B) 25.0 mg 
C) 12.5 mg 
D) 6.25 mg 
E) 3.13 mg 
A) 50.0 mg 
B) 25.0 mg 
C) 12.5 mg 
D) 6.25 mg 
E) 3.13 mg C

Question 4

A positron is a particle emitted from the nucleus that has the same mass as a(n)

Accepted Answer

A) electron but has a positive charge. 
B) neutron but has a positive charge. 
C) alpha particle. 
D) beta particle. 
E) proton emitted from the nucleus. 
A) electron but has a positive charge. 
B) neutron but has a positive charge. 
C) alpha particle. 
D) beta particle. 
E) proton emitted from the nucleus.

Question 5

When a gamma ray is emitted from the nucleus of an atom, the nuclear mass

Accepted Answer

A) increases by two units. 
B) decreases by one unit. 
C) increases by one unit. 
D) decreases by two units. 
E) remains the same. 
A) increases by two units. 
B) decreases by one unit. 
C) increases by one unit. 
D) decreases by two units. 
E) remains the same.

Question 6

The unit used to measure the amount of radiation absorbed by a gram of material is called then

Accepted Answer

A) rad. 
B) RBE. 
C) curie. 
D) rem. 
E) MPD. 
A) rad. 
B) RBE. 
C) curie. 
D) rem. 
E) MPD.

Question 7

A patient receives 4.2 × 103 mrads of iodine-131, which emits β-particles. If the factor that adjusts for biological damage is 1 for β-particles, how many rems did the patient receive?

Accepted Answer

A) 4 
B) 0.4 
C) 0.3 
D) 2 
E) 40 
A) 4 
B) 0.4 
C) 0.3 
D) 2 
E) 40

Question 8

The dosage of technetium-99m for myocardial imaging is 280 μCi/kg of body weight. How many mCi should be given to a patient weighing 65 kg? (1 mCi = 1000 μCi)

Accepted Answer

A) 0.0043 mCi 
B) 4.3 mCi 
C) 18 mCi 
D) 230 mCi 
E) 1.8 × 104 mCi 
A) 0.0043 mCi 
B) 4.3 mCi 
C) 18 mCi 
D) 230 mCi 
E) 1.8 × 104 mCi

Question 9

The damaging effects of radiation on the body are a result of

Accepted Answer

A) the formation of unstable ions or radicals. 
B) the formation of radioactive atoms in the body. 
C) transmutation reactions in the body. 
D) extensive damage to nerve cells. 
E) the production of radioactive sodium ions in the body. 
A) the formation of unstable ions or radicals. 
B) the formation of radioactive atoms in the body. 
C) transmutation reactions in the body. 
D) extensive damage to nerve cells. 
E) the production of radioactive sodium ions in the body.

Question 10

A wooden object from a prehistoric site has a carbon-14 activity of 10 counts per minute (cpm) compared to 40 cpm for new wood. If carbon-14 has a half-life of 5730 years, what is the age of the wood?

Accepted Answer

A) 1430 yr 
B) 5730 yr 
C) 11,500 yr 
D) 17,200 yr 
E) 22,900 yr 
A) 1430 yr 
B) 5730 yr 
C) 11,500 yr 
D) 17,200 yr 
E) 22,900 yr

Question 11

The production of nitrogen-13 and a neutron from boron-10 by bombardment with a helium-4 nucleus is an example of radioactive decay.

Accepted Answer

A) True 
 B)False

Question 12

An imaging technique that detects the energy emitted by hydrogen atoms in a magnetic field is known as

Accepted Answer

A) positron emission tomography (PET). 
B) computerized tomography (CT). 
C) magnetic resonance imaging (MRI). 
D) radioactive tracer study. 
E) supermagnetic tomography (SMT). 
A) positron emission tomography (PET). 
B) computerized tomography (CT). 
C) magnetic resonance imaging (MRI). 
D) radioactive tracer study. 
E) supermagnetic tomography (SMT).

Question 13

If the half-life of hydrogen-3 is 11.8 years, after two half-lives the radioactivity of a sample will be reduced to one-half of the original amount.

Accepted Answer

A) True 
 B)False

Question 14

Radium-226 decays by alpha decay to

Accepted Answer

A) barium-131. 
B) cobalt-60. 
C) carbon-14. 
D) polonium-218. 
E) radon-222. 
A) barium-131. 
B) cobalt-60. 
C) carbon-14. 
D) polonium-218. 
E) radon-222.

Question 15

A sample of technetium-99m has an activity of 1.5 Ci. How many disintegrations occur in the technetium-99m sample in 5.0 sec?

Accepted Answer

A) 5.6 × 1010 
B) 2.8 × 1011 
C) 1.1 × 1010 
D) 7.5 
E) 2.0 × 10-10 
A) 5.6 × 1010 
B) 2.8 × 1011 
C) 1.1 × 1010 
D) 7.5 
E) 2.0 × 10-10

Question 16

What is the radioactive particle released in the following nuclear equation?   W →   Hf + ?

Accepted Answer

A) alpha particle 
B) beta particle 
C) gamma ray 
D) proton 
E) neutron 
A) alpha particle 
B) beta particle 
C) gamma ray 
D) proton 
E) neutron

Question 17

A beta particle is emitted when Co-60 decays to Fe-60.

Accepted Answer

A) True 
 B)False

Question 18

U +   n → ________ +   Kr + 3   n + energy

Accepted Answer

The answer of   U +   n...

Question 19

The recommended dosage of I-131 for a test is 4.2 microcuries per kg of body weight. How many mCi should be given to a 55 kg patient? (1 mCi = 1000 μCi)

Accepted Answer

A) 230 mCi 
B) 0.23 mCi 
C) 0.076 mCi 
D) 760 mCi 
E) 13.8 mCi 
A) 230 mCi 
B) 0.23 mCi 
C) 0.076 mCi 
D) 760 mCi 
E) 13.8 mCi

Question 20

What is missing in the nuclear reaction shown below? 
  B +   He → ________ +   n

Accepted Answer

A) a neutron 
B)  B 
C)  N 
D)  N 
E)  N 
A) a neutron 
B)  B 
C)  N 
D)  N 
E)  N

Exam 5: Nuclear Chemistry

One mCi of a radioactive substance emits more radiation than one μCi of the same substance.

The nuclear reaction Sn → Sb + ? is an example of

Iodine-123, which is used for diagnostic imaging in the thyroid, has a half-life of 13 hours. If 50.0 mg of I-123 were prepared at 8:00 a.m. on Monday, how many mg remain at 10:00 a.m. on the following day?

A positron is a particle emitted from the nucleus that has the same mass as a(n)

When a gamma ray is emitted from the nucleus of an atom, the nuclear mass

The unit used to measure the amount of radiation absorbed by a gram of material is called then

A patient receives 4.2 × 103 mrads of iodine-131, which emits β-particles. If the factor that adjusts for biological damage is 1 for β-particles, how many rems did the patient receive?

The dosage of technetium-99m for myocardial imaging is 280 μCi/kg of body weight. How many mCi should be given to a patient weighing 65 kg? (1 mCi = 1000 μCi)

The damaging effects of radiation on the body are a result of

A wooden object from a prehistoric site has a carbon-14 activity of 10 counts per minute (cpm) compared to 40 cpm for new wood. If carbon-14 has a half-life of 5730 years, what is the age of the wood?

The production of nitrogen-13 and a neutron from boron-10 by bombardment with a helium-4 nucleus is an example of radioactive decay.

An imaging technique that detects the energy emitted by hydrogen atoms in a magnetic field is known as

If the half-life of hydrogen-3 is 11.8 years, after two half-lives the radioactivity of a sample will be reduced to one-half of the original amount.

Radium-226 decays by alpha decay to

A sample of technetium-99m has an activity of 1.5 Ci. How many disintegrations occur in the technetium-99m sample in 5.0 sec?

What is the radioactive particle released in the following nuclear equation? W → Hf + ?

A beta particle is emitted when Co-60 decays to Fe-60.

U + n → ________ + Kr + 3 n + energy

The recommended dosage of I-131 for a test is 4.2 microcuries per kg of body weight. How many mCi should be given to a 55 kg patient? (1 mCi = 1000 μCi)

What is missing in the nuclear reaction shown below? B + He → ________ + n

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A patient receives 4.2 × 10³ mrads of iodine-131, which emits β-particles. If the factor that adjusts for biological damage is 1 for β-particles, how many rems did the patient receive?