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Rad 510 > Occupational Doses and Radiation Saftey > Flashcards

Occupational Doses and Radiation Saftey Flashcards

1
Q

Occupational annual limit is for the

A

whole body/ total effective dose equivalent

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1
Q

Occupational annual limit

A

50mSv/year

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2
Q

Occupational Dose for lens of eye

A

150 mSv/year

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3
Q

Occupational Dose for skin

A

500mSv/ year

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4
Q

Occupational Dose extremities

A

500mSv/ year

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5
Q

Occupational Dose pregnancy/ fetal dose

A

5mSv

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6
Q

Pregnancy doses: permanent sterility (adult)

A

5Gy

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7
Q

Pregnancy doses: embryonic death

A

100-500mGy

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8
Q

Pregnancy doses: max permitted dose to fetus of pregnant worker

A

0.5mSv (50mrem)

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9
Q

Pregnancy doses: total gestational dose equivalent

A

5mSv (500mrem)

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10
Q

Pregnancy doses: risk of congential malformation

A

120 to 1 rem

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11
Q

Non occupational Doses: annual limit

A

1mSv/year

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12
Q

Non occupational Doses: expsoure to radon and its decay products

A

> 0.007 Jhm^-3

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13
Q

Non occupational Doses: hourly limit from external sources in unrestricted areas

A

0.02mSv

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14
Q

Non occupational Doses: lens of eye, skin and extremities

A

50mSv

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15
Q

Package surface dose

A

2mSv/ hour at any point on the package surface

16
Q

2 meters from the packakage

A

0.1 mSv/ hour

17
Q

Primary barrier thickness formula

A

P=BWUT/d^2

18
Q

Primary barrier thickness: B

A

Barrier transmission factor

19
Q

Primary barrier thickness: W

A

workload

20
Q

Primary barrier thickness: U

A

use

21
Q

Primary barrier thickness: T

A

occupancy

22
Q

Primary barrier thickness: d

A

distance from target/ source of radiation

23
Q

MRI: Magnetism

A

electromagnetic property with the same directionality as the magnetic moment in an atomic nucleus

24
Q

MRI is divided into three stages

A

magnetization, resonance, relaxation

25
Q

MRI uses what atom in the body

A

hydrogen

26
Q

MRI Resonance occurs when

A

an external magnetic field is applied

27
Q

MRI: Resonance defintion

A

The magnetic moments of the hydrogen atom, which were previously going in different directions, align in the same direction when a magnetic field is applied

28
Q

MRI relaxation

A

when the external magnetic field disappears, the release of energy when and atom returns to its original state

29
Q

How do we get the MRI image

A

imaging the energy signals generated from relaxation of the hydrogen atoms

30
Q

Can we image titanium with MRI

A

yes, does not affect the magnetic field

31
Q

Can we image craniofacial titanium plates

A

Must ask vendor what alloy is used in titanium as it could contain unsafe MRI material

Rad 510 (4 decks)

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