pages 58-63 last minute added exam info

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1

What is the annual and lifetime dose for occupational workers?

Annual: 50 mSv (5 rem)

Lifetime: 10 mSv (1rem) x years of age

2

What is the annual dose for the general public?

Annual: 1 mSv (100 mrem)

3

What is the annual dose for individuals less than 18 years of age?

1 mSv (100 mrem)

4

What is the dose limiting recommendations for pregnant workers?

0.5 mSv (50 mrem)

gestational period 5 mSv (500 mrem)

5

ALARA

As Low As Reasonably Achievable

6

Four important ways ALARA can be achieved

Always wear personal monitoring device

use mechanical holding devices if procedure permits

close collimation

time-distance-shielding

7

what are the cardinal principles

time

distance

shielding

8

Gonadal contact shields are made of

1 mm lead equivalent

9

gonadal shielding absorbs what percentage of primary rays in the 50-100 kV range?

95-99%

10

What is the minimum total filtration (inherent plus added) for diagnostic radiology (excluding mammography)?

2.5 mm aluminum for equipment operating at 70 kV or higher

11

Air kerma

indicates the amount of energy transferred to a mass of air photons

12

Rad to Gray (Gy) conversion

Multiply by 10-2

1 Rad = 0.01 Gy

13

Roentgen to C/kg (coulomb per kilogram)

multiply by 2.58 x 10-4

1 R = 0.000258

14

Rem to Sievert (Sv)

multiply by 10-2

1 Rem = 0.01 Sv

15

Rad or Gy

unit for absorbed dose

used primarily for patient dose

16

Rem or Sv

effective dose

used primarily for radiation protection purposes

17

shadow shielding

attach to the collimator, placed between the x-ray tube and the patient and cast a shadow on the patient when the collimator light is turned on. The shadow defines the shielded area

18

contact shields

vinyl covered lead shields placed over patients to attenuate scatter or leakage radiation or both.