Radiographic Testing

Question 1

The penetrating ability of an X-ray beam is governed by:

A. kilovoltage or wavelength (energy)

B. time

C. milliamperage

D. source-to-film distance

Answer 1

1) - A

Question 2

If two X-ray machines are set to the same kilovoltage and milliamperage, which is true?

A. same intensity & energy

B. same intensity but different energy

C. same energy but different intensity

D. different intensity & different energy

Answer 2

2) - D

Question 3

Short wavelength electromagnetic radiation from radioactive decay is called:

A. X-radiation

B. gamma radiation

C. scatter radiation

D. beta radiation

Answer 3

3) - B

Question 4

Almost all gamma radiography is performed with:

A. natural isotopes

B. artificial isotopes

C. radium

D. Co-60

Answer 4

4) - B

Question 5

Energy of gamma rays is expressed in:

A. Gigabecquerel (Curie)

B. Coulomb/kg (Rontgen)

C. Half-life

D. keV or MeV

Answer 5

5) - D

Question 6

Most penetrating radiation comes from:

A. Co-60

B. 220 kVp X-ray tube

C. 15 MeV betatron

D. electrons from Ir-192

Answer 6

6) - C

Question 7

Difference between densities of two areas on radiograph is called:

A. radiographic contrast

B. subject contrast

C. film contrast

D. definition

Answer 7

7) - A

Question 8

Ionization of gases makes them useful in:

A. X-ray transformers

B. fluoroscopes

C. masks

D. radiation-detection equipment

Answer 8

8) - D

Question 9

Why increase exposure by factor of four when distance doubled:

A. intensity decreases exponentially

B. energy inversely proportional to sqrt distance

C. intensity inversely proportional to square distance

D. scatter increases

Answer 9

9) - C

Question 10

Most important factor in X-ray absorption:

A. thickness

B. density

C. Young’s modulus

D. atomic number

Answer 10

10) - D

Question 11

Maximum permissible yearly dose 0.05 Sv for:

A. extremities

B. skin

C. whole body

D. fetus

Answer 11

11) - C

Question 12

Small dose exposure:

A. cumulative

B. beneficial

C. no effect

D. short-term only

Answer 12

12) - A

Question 13

Technique variable adjusting subject contrast:

A. distance

B. milliamperage

C. kilovoltage

D. focal spot size

Answer 13

13) - C

Question 14

Difference between radiograph & fluoroscopic image:

A. fluoro more sensitive

B. fluoro positive vs negative

C. fluoro brighter

D. no difference

Answer 14

14) - B

Question 15

Lead foil increases density because:

A. fluoresce

B. absorb scatter

C. prevent backscatter fog

D. emit electrons

Answer 15

15) - D

Question 16

Back of cassette image indicates:

A. undercut

B. overexposure

C. intensity too high

D. backscatter radiation

Answer 16

16) - D

Question 17

IQI measures:

A. size of discontinuities

B. film density

C. technique quality

D. penetrating radiation amount

Answer 17

17) - C

Question 18

IQIs placed:

A. between screen & film

B. source side

C. film side

D. between operator & source

Answer 18

18) - B

Question 19

Material for shielding >400kV:

A. concrete

B. aluminum

C. steel

D. boron

Answer 19

19) - A

Question 20

Megavolt radiography:

A. high subject contrast

B. high radiographic contrast

C. thick specimens

D. only stainless

Answer 20

20) - C

Question 21

Equivalent Inconel thickness:

A. 3 mm

B. 9 mm

C. 18 mm

D. 36 mm

Answer 21

21) - A

Question 22

Characteristic X-ray pattern basis for:

A. xeroradiography

B. X-ray diffraction

C. fluoroscopy

D. polymorphic testing

Answer 22

22) - B

Question 23

Fluoroscopy detects in light metal casting:

A. copper shrinkage

B. microshrinkage

C. shrinkage

D. fine cracks

Answer 23

23) - C

Question 24

Best for laminar discontinuities in 25mm steel:

A. Ir-192

B. Co-60

C. 250 kVp

D. ultrasonic device

Answer 24

24) - D

Question 25

Best double V-groove weld technique: A. single exposure perpendicular B. two exposures ±30° C. two offset exposures D. single exposure two films ±30°

Answer 25

25) - B

Question 26

Film measurement must include: A. projection magnification B. film latitude C. characteristic slope D. IQI alignment

Answer 26

26) - A

Question 27

Best IQI for broken copper leads: A. steel plaques B. plastic block drilled holes C. plastic with copper wires D. copper shims

Answer 27

27) - C