Health Physics Ch 37

Question 1

Concerned with providing occupational
radiation protection & minimizing radiation
dose to the public

Answer 1

Health Physics

Question 2

A radiation scientist who is concerned with
the research, teaching or operational aspects
of radiation safety

Answer 2

Health Physicist

Question 3

Cardinal Principles of Radiation Protection

Answer 3

Purpose, Time, Distance, Shielding

Question 4

The time of exposure should be kept to a

minimum

Answer 4

Minimize Time

Question 5

Sequencing on-off rather than continuous on

during examination

Answer 5

Fluoroscopic Footswitch

Question 6

It reminds the radiologist that a considerable

amount of fluoroscopic time has elapsed

Answer 6

5-Minute Reset Timer

Question 7

It takes less than 5 minutes

Answer 7

Fluoroscopic Procedure

Question 8

It takes more than 5 minutes

Answer 8

Interventional Radiology Procedure

Question 9

Radiation dose is inversely related to the

distance between the source & the patient

Answer 9

Maximize Distance

Question 10

It states that the intensity of radiation at a
location is inversely proportional to the
square of its distance from the source of
radiation

Answer 10

Inverse Square Law

Question 11

Inverse Square Law Formula

Answer 11

I1/I2 = (d2/d1)squares

Question 12

What distance from the sourcr is treated as a point source

Answer 12

Five times the source diameter

Question 13

It states that one can compensate for a
change in the source-to-object dstance by
changing the mAs by the factor SID squared

Answer 13

Square Law

Question 14

Square Law Formula

Answer 14

I1/I2 = (D1/D2) squared

Question 15

A point source of radiation

Answer 15

X-ray Tube Target

Question 16

Lines that represent positions of equal

radiation exposure in the fluoroscopy room

Answer 16

Isoexposure Lines

Question 17

It greatly reduces the level of radiation

exposure

Answer 17

Shielding

Question 18

The thickness of absorber necessary to
reduce radiation intensity to half its original
value

Answer 18

Half-Value Layer (HVL)

Question 19

The thickness of absorber necessary to
reduce radiation intensity to one-tenth its
original value

Answer 19

Tenth-Value Layer (TVL)

Question 20

Based on total body radiation exposure

Answer 20

Radiation Risk Coefficient

Question 21

The equivalent whole-body dose

Answer 21

Effective Dose

Question 22

The weighted average of the radiation dose

to various organs & tissues

Answer 22

Equivalent Whole-Body Dose

Question 23

Those individuals who must make the first
decisions & take the first steps in the early
stages of such an event

Answer 23

Emergency Responder

Question 24

Radiologic Devices

Answer 24

• Radiation Exposure Device (RED)
• Radiologic Dispersal Device (RDD)
• Improvised Nuclear Device (IND)

Question 25

A sealed source of radioactive material that

directly exposed people

Answer 25

Radiation Exposure Device (RED)

Question 26

A bomb that when exploded disperses

radioactive contamination over a wide area

Answer 26

Radiologic Dispersal Device (RDD)

Question 27

It contains nuclear material that can produce

a nuclear explosion

Answer 27

Improvised Nuclear Device (IND)