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CORE Radiology > Radiation Biology > Flashcards

Radiation Biology Flashcards

1
Q

Depress circulating lymphocytes

A

0.25 Gy

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2
Q

Bone Marrow Acute Radiation Syndrome (dose and latent period)

A

> 2 Gy

1-6 weeks

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3
Q

GI Acute Radiaition Syndrome (dose and latent period)

A

> 8 Gy

5-7 days

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4
Q

CNS Acute Radiation Syndrome (dose and latent period)

A

> 20-50 Gy

4-6 hours

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5
Q

Nausea 30% of time

A

1 Gy

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6
Q

LD 50/30 (without/with treatment)

A

3-4 Gy without

8.5 Gy with

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7
Q

LD 50/60 (for bone marrow failure)

A

3-4 Gy

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8
Q

LD 50/4 (GI failure)

A

10 Gy

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9
Q

Fetal - first 2 weeks

A

50-100 mGy for fetal loss (all or nothing)

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10
Q

Fetal - 8-15 weeks

A

> 100-200 mGy reduced head diameter and mental retardation
30 IQ point drop per 1 Sv
with 1 Sv 40% chance retardation

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11
Q

Fetal - >15 weeks

A

less sensitive

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12
Q

Fetal - 3-8 weeks

A

> 250 mSv growth retardation

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13
Q

Increased risk childhood cancer (after week 9)

A

10-20 mSv

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14
Q

Fetal thyroid vulnerable

A

week 9 onward

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15
Q

Adult and child cancer risk (BEIR 5 and UNSCEAR)

A

8%/Sv, but with reduction factor 4-5%/Sv (1/10 if older than 50)
Up to 15%/Sv for child

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16
Q

Early transient erythema (dose and onset)

A

2 Gy

hours

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17
Q

Severe, robust, erythema (dose and onset)

A

6 Gy

1 week

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18
Q

Telangiectasia (dose and onset)

A

10 Gy

52 weeks

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19
Q

Dry desquamation (dose and onset)

A

13 Gy

4 weeks

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20
Q

Moist desquamation/ulceration (dose and onset)

A

18 Gy

4 weeks

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21
Q

Secondary ulceration (dose and onset)

A

24 Gy

>6 weeks

22
Q

Temporary epilation (dose and onset)

A

3 Gy

21 days

23
Q

Permanent epilation (dose and onset)

A

7 Gy

21 days

24
Q

Annual lens dose rate limit

A

150 mSv (might become 20 mSv)

25
Q

Acute or chronic exposure for cataract

A

0.5 Gy (others say 2.5 Gy)

26
Q

Male temporary sterility

A

0.15-2.5 Gy

27
Q

Male permanent sterility

A

5 Gy

28
Q

Female permanent sterility (age 12)

A

10 Gy

29
Q

Female permanent sterility (age 45)

A

2 Gy

30
Q

Female permanent sterility (no age)

A

6 Gy

31
Q

Double natural/spontaneous mutation rate

A

1 Gy

32
Q

Effective dose of US background radiation

A

3 mSv/year (55% radon)

33
Q

Sentinel event dose

A

15 Gy to single field

34
Q

Radiation worker dose limit

A

50 mSv/yr

35
Q

Radiation worker extremity/organ dose limit

A

500 mSv/yr

36
Q

Public exposure (infrequent)

A

5 mSv/yr

37
Q

Public exposure (continuous)

A

1 mSv/yr

38
Q

Fetus of worker for pregnancy

A

5 mSv

39
Q

Fetus (post declared pregnancy)

A

0.5 mSv/month

40
Q

Controlled areas - public exposure

A

50 mSv/yr

41
Q

Uncontrolled areas - public exposure

A

5 mSv/yr

42
Q

Genetically significant dose

A

0.25 mSv

43
Q

Radiation Area Sign

A

0.005 rem/hr (0.05 mSv/hr) at 30 cm

44
Q

Radioiodine limit for admission

A

7 mR/hr at 1 meter from chest

33 mCi of residual activity

45
Q

High Radiation Area Sign

A

0.1 rem/hr (1 mSv/hr) at 30 cm

46
Q

Very High Radiation Area Sign

A

500 rad/hr (5 gray/hr) at 1 meter

47
Q

Receiving radioactive material wipe test

A

> 6600 dpm/300 cm2 not allowed

48
Q

White 1 (surface and 1 meter)

A

< 0.5 mrem/hr surface

0 mrem/hr at 1 meter

49
Q

Yellow 2 (surface and 1 meter)

A

< 50 mrem/hr surface

< 1 mrem/hr at 1 meter

50
Q

Yellow 3 (surface and 1 meter)

A

< 200 mrem/hr surface

< 10 mrem at 1 meter

51
Q

Nuclear restricted area

A

> 2mrem/hr or > 100 mrem/year

CORE Radiology (3 decks)

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