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Physics > Radiation Protection > Flashcards

Radiation Protection Flashcards

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1
Q

How many mrem in a mSv?

A

1 mSv = 100 mrem

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2
Q

Dose equivalent?

A

dose x weighting factor

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3
Q

Effective dose equivalent?

A

Sum of dose equivalents per organ (tissue)

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4
Q

Annual dose from background radiation?

A

6 mSv/yr

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5
Q

How many mSv in a rem?

A

10

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6
Q

Annual limit for occupational worker?

A

50 mSv

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7
Q

Annual limit for occupational worker hands?

A

500 mSv

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8
Q

Annual limit for occupational worker eye?

A

50 mGy

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9
Q

Annual limit for general public?

A

1 mSv

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10
Q

Annual limit for public visiting a person who cannot be released from the hospital?

A

5 mSv

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11
Q

Annual limit for a child?

A

1 mSv

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12
Q

Annual limit for the general public eye?

A

15 mSv

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13
Q

Annual limit for the general public hand?

A

50 mSv

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14
Q

Annual limit for the general public in an unrestricted area?

A

0.02 mSv/hr

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15
Q

Monthly limit for declared pregnancy?

A

0.5 mSv/month
5 mSv for entire pregnancy

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16
Q

Lifetime dose limit?

A

10 mSv x age

17
Q

How much dose from a diagnostic CT body?

A

~10 mSv

Plain radiography ~0.1 mSv

Whole body CT > lower GI series > angiography > CT > upper GI series

18
Q

What is a reportable medical event?

A

> 0.05 Sv deviation from effective dose equivalent or >0.5 Sv to organ AND:

> 20% deviation from total dose
OR
50% deviation from single fraction dose
OR
Wrong drug/patient/site/route/treatment mode, or leaking sealed source

19
Q

How often is a leak test done? What is failure to pass?

A

Every 6 months
>185 Bq (0.005 uCi)

20
Q

What is the dose rate for a controlled radiation area?

A

0.1 mSv/wk
(>2 mrem/hr)

21
Q

What is the dose rate for a radiation area?

A

> 5 mrem/hr

22
Q

What is the dose rate for a high radiation area?

A

> 100 mrem/hr

23
Q

What is the dose rate for a very high radiation area?

A

> 500 mrem/hr

24
Q

What is a yellow II transportation index?

A

Surface <50 mR/hr and <1 at 1 meter

White: surface <0.5 mR/hr and undetectable at 1 meter

Yellow III: surface >50 mR/hr OR >1 at 1 meter

25
Q

What is the maximum dose rate in a controlled area?

A

0.1 mSv/week (5 mSv/yr)

26
Q

What is the maximum dose rate in an uncontrolled area?

A

0.02 mSv/week (1 mSv/yr)

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