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Radiation Protection > Airborne Radioactivity > Flashcards

Airborne Radioactivity Flashcards

1
Q

Pathways for airborne dose

A
  1. External (submersion)
  2. Inhalation
  3. Ingestion
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2
Q

Submersion dose is limited for what?

A

Inert gases (noble gases)

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3
Q

3 noble gases

A

argon
krypton
xenon
Submersion dose risk b/c not absorbable

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4
Q

Hazard from a toxicant

A
  1. inherent toxicity

2. probability of reaching target site

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5
Q

components of airborne contaminants

A

Gaseous

Particulate

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6
Q

Difference between Gaseous and Particulate contaminants

A

Gases do not settle, particles do settle

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7
Q

Particle kinetics at < 0.1 Micron

A

thermodynamic properties

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8
Q

Particle kinetics 0.1 - 1.0 micron

A

thermodynamic and aerodynamic properties

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9
Q

Particle kinetics > 1.0 micron

A

aerodynamic properties

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10
Q

Thermodynamic properties of particle kinetics

A

Behaves like a gas - driven by diffusion

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11
Q

Aerodynamic properties of particle

A

behaves like a particle - driven by gravity and air resistance

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12
Q

MMAD

A

mass median aerodynamic diameter

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13
Q

terminal velocity

A

velocity where retarding forces equal gravitational forces

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14
Q

effect on dispersion from terminal velocity

A

low terminal velocity leads to more dispersion

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15
Q

3 methods of lung clearance

A
  1. cilia
  2. capillary absorption
  3. macrophage phagocytosis
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16
Q

Geometric LL CI

A

m / sigma^2

17
Q

Geometric UL CI

A

m x sigma^2

18
Q

Arithmetic LL CI

A

m - (2 x sigma)

19
Q

Arithmetic UL CI

A

m + (2 x sigma)

20
Q

ICRP 30 clearance regions

A

Nasopharyngeal
Tracheobronchial
Pulmonary

21
Q

Pulmonary clearance methods

A

phagocytosis
cilia/coughing
capillaries
lymph drainage

22
Q

NALI

A

0.5 Sv

23
Q

SALI

A

0.05 Sv

24
Q

DAC

A

Derived air concentration

amount in air that if inhaled will lead to the ALI if breathed for a year

Radiation Protection (11 decks)

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