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Chapter 3

front 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

back 1

1 centisievert = 1 rem

front 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

600 rads

60 R

back 2

6000 cGy

front 3

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

Thomas A. Edison

Wilhelm C. Roentgen

Clarence Madison Dally

Marie Curie

back 3

Clarence Madison Dally

front 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

back 4

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

front 5

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

1910

1930

1937

1945

back 5

1910

front 6

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

15

13.8

7.4

5.9

back 6

7.4

front 7

Beta particles are actually:

gamma rays

high-speed electrons

protons

x-rays

back 7

high-speed electrons

front 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

back 8

Exposure

front 9

Ten C/kg equals __________ roentgen.

2.58 ´ 10–4

25.8 ´ 10–4

3.9 ´ 104

39 ´ 104

back 9

3.9 ´ 104

front 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

back 10

joule

front 11

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

1

5

10

20

back 11

20

front 12

One millirem equals ___________ rem.

1/10

1/100

1/1000

1/10,000

back 12

1/1000

front 13

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

1 only

2 only

3 only

1 and 3 only

back 13

1 and 3 only

front 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

back 14

also increases

front 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

back 15

Quantity of ionization

front 16

Fifteen sievert equals __________ rem.

15

150

1500

15,000

back 16

1500

front 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

back 17

Bone

front 18

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

ampere

Coulomb per kilogram

erg

sievert

back 18

ampere

front 19

45 rem equals _________ mSv.

4.5

45

450

4500

back 19

450

front 20

Thirty-five mSv equals __________ rem.

0.35

3.5

35

350

back 20

3.5

front 21

Which of the following equals 400 rem?

4 mSv

40 mSv

400 mSv

4000 mSv

back 21

4000 mSv

front 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

back 22

X-rays, beta particles, and gamma rays

front 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 rad

1 Gy

back 23

1 Gy

front 24

Who discovered x-rays on November 8, 1895?

Thomas A. Edison

Clarence Madison Dally

Louis Harold Gray

Wilhelm Conrad Roentgen

back 24

Wilhelm Conrad Roentgen

front 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

back 25

1, 2, and 3