##### Chapter 3

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1

Which of the following statements is true?

1 centisievert = 100 rem

1 centisievert = 10 rem

1 centisievert = 1 rem

1 centisievert = 0.1 rem

1 centisievert = 1 rem

2

If a patient receiving x-ray therapy treatment receives a total dosage of 6000 rads, the dosage may be recorded as _____if the SI system is used.

12,000 Gy

6000 cGy

60 R

6000 cGy

3

Who was the first American radiation worker to die from radiation-induced cancer in October 1904?

Thomas A. Edison

Wilhelm C. Roentgen

Marie Curie

4

Which of the following statements is correct?

1 C/kg of dry air = mc013-1.jpg

1 C/kg of dry air = mc013-2.jpg

2.58 ´ 10–4 C/kg of dry air = 10 sievert

2.58 ´ 10–4 C/kg of dry air = 50 roentgen

1 C/kg of dry air = mc013-2.jpg

5

Among physicians, cancer deaths attributed to x-ray exposure were reported as early as:

1910

1930

1937

1945

1910

6

The effective atomic number (Zeff) of soft tissue is:

15

13.8

7.4

5.9

7.4

7

Beta particles are actually:

gamma rays

high-speed electrons

protons

x-rays

high-speed electrons

8

For x-ray and gamma ray photons with energies up to 3 million electron volts (MeV), which of the following quantities may be defined as the measure of the total electrical charge of one sign, either all pluses or all minuses, per unit mass that these two kinds of radiation generate in air only?

Absorbed dose

Equivalent dose

Exposure

Collective effective dose

Exposure

9

Ten C/kg equals __________ roentgen.

2.58 ´ 10–4

25.8 ´ 10–4

3.9 ´ 104

39 ´ 104

3.9 ´ 104

10

Which of the following units is a unit of energy that may be defined as the work done or energy expended when a force of 1 newton (N) acts on an object along a distance of 1 meter (m)?

Coulomb per kilogram

erg

gray

joule

joule

11

Alpha particles have a radiation weighting factor (WR) that is numerically equal to:

1

5

10

20

20

12

One millirem equals ___________ rem.

1/10

1/100

1/1000

1/10,000

1/1000

13

Which of the following units are not SI units?
1. roentgen
2. Coulomb per kilogram, gray, sievert

1 only

2 only

3 only

1 and 3 only

1 and 3 only

14

As the intensity of x-ray exposure of the air volume increases, the number of electron-ion pairs produced:

also increases

decreases considerably

decreases slightly

remains the same

also increases

15

Which of the following effects must be measured to determine the total amount of radiation exposure in a specific volume of dry air under standard conditions of pressure and temperature (760 mm Hg or 1 atmosphere at sea level and 22o C)?

Biologic damage

Cellular activity

Energy absorption

Quantity of ionization

Quantity of ionization

16

Fifteen sievert equals __________ rem.

15

150

1500

15,000

1500

17

In the diagnostic radiology energy range (which includes mammography) from 23 to 150 kVp, which of the following tissues possesses the greatest ability to absorb radiant energy through the process of photoelectric absorption?

Air

Bone

Fat

Muscle

Bone

18

Which of the following is the SI unit of electrical current?

ampere

Coulomb per kilogram

erg

sievert

ampere

19

45 rem equals _________ mSv.

4.5

45

450

4500

450

20

Thirty-five mSv equals __________ rem.

0.35

3.5

35

350

3.5

21

Which of the following equals 400 rem?

4 mSv

40 mSv

400 mSv

4000 mSv

4000 mSv

22

Which of the following are types of ionizing radiation that produce virtually the same biologic effect for equal absorbed doses in body tissue?

X-rays, beta particles, and gamma rays

Alpha particles, beta particles, and gamma rays

X-rays, neutrons, and gamma rays

X-rays, alpha particles, and fast neutrons

X-rays, beta particles, and gamma rays

23

In the SI system, an energy absorption of 1 joule (J) per kilogram of matter in the irradiated object equals which of the following?

10 Sv

5 C/kg

1 Gy

1 Gy

24

Who discovered x-rays on November 8, 1895?

Thomas A. Edison

Louis Harold Gray

25

Of the following equivalents, which equals 1 rad?
1. 100 erg/g
2. 1/100 J/kg
3. 0.01 Gy

1 only

2 only

3 only

1, 2, and 3

1, 2, and 3