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Radiology CORE Exam > NUCS > Flashcards

NUCS Flashcards

1
Q

Tc99m (T1/2 and Energy)

A

6hrs

140 keV

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2
Q

Tc99m (Prod and Decay)

A

Generator

Isomeric Transition

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3
Q

Xe 133 (T1/2 and Energy)

A

5.3 days

81 keV

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4
Q

Tl 201 (T1/2 and Energy)

A

73 hours

69-81 keV

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5
Q

In-111 (T1/2 and Energy)

A

67 hours

172/247 keV

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6
Q

Ga-67 (T1/2 and Energy)

A

78 hours

90, 190, 290 keV

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7
Q

I-123 (T1/2 and Energy)

A

13 hours

159 keV

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8
Q

I-131 (T1/2 and Energy)

A

8 days

364 (G) and 606 (B)

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9
Q

F18 (T1/2 and Energy)

A

110 minutes

511

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10
Q

Max Mo in Tc? Term?

A

0.15 micro Ci per 1 mCi of Tc (UNITS!)

Radionuclide purity

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11
Q

Max Al contamination in Tc? Term?

A

<10 mcg Al per 1mL

Chemical purity

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12
Q

How can aluminum contamination show up on a

1) free Tc scan
2) Sulfer Colloid scan

A

1) Liver activity
2) Lung activity
Happens bc Al clumps the tech

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13
Q 
How much free Tc in
1) Na99mTc
2) 99mTc Sulfer Colloid
3) All other Tc products
Term?
A

1) 95%
2) 92%
3) 91%
Radiochemical Purity

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14
Q

Formula for effective half life

A

1/Eff = 1/Phys + 1/Biol

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15
Q

If using two tracers in the same patient/study, what order should they be used in ?

A

Lower energy tracer first to prevent downscatter from muddying the picture

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16
Q

How often is gamma camera field uniformity (flood) performed for 1)extrinsic and 2)intrinsic evaluation?

A

Extrinsic is daily and includes the collimator

Intrinsic is weekly and does not use collimator

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17
Q

How often is gamma camera energy window tested?

A

Daily

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18
Q

How often is gamma camera linearity tested?

A

Weekly

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19
Q

How often is gamma camera center of rotation tested?

A

Monthly

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20
Q

How often is gamma camera spatial resolution tested?

A

Weekly

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21
Q

What is the maximum accurately detectable dose by a Geiger counter?

A

100mR/h

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22
Q

What is the detectable range for an ionization chamber?

A

0.1-100R/h (note units, this R/h vs mR/h for Geiger)

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23
Q

What type of instrument is a dose calibrator?

A

Ionization chamber

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24
Q

What is the consistency tolerance (+/-) for a dose calibrator? How often is it checked?

A

5%, daily

25
Q

How frequently is linearity for a dose calibrator checked?

A

Quarterly

26
Q

How frequently is accuracy for a dose calibrator checked?

A

At installation and annually

27
Q

How frequently is dose calibrator geometry checked?

A

At installation and anytime the device is moved

28
Q

What constitutes a major spill of Tc99?

A

100mCi

29
Q

What constitutes a major spill of Tl-201?

A

100mCi

30
Q

What constitutes a major spill of In-111?

A

10mCi

31
Q

What constitutes a major spill of I-123?

A

10mCi

32
Q

What constitutes a major spill of Ga-67?

A

10mCi

33
Q

What constitutes a major spill of I-131?

A

1mCi

34
Q

Gy=rad=rem=mSv

A

1 Gy = 100 rad/rem = 1 Sv

35
Q

Annual dose limit for public

A

100mRem

36
Q

Unrestricted area max dose

A

2mRem/hr

37
Q

Radiation area definition

A

0.005-0.1 Rem/hr at 30cm (0.05 mSv)

38
Q

High radiation area definition

A

0.1-500 Rem/hr at 30cm (1 mSv)

39
Q

Very high radiation area definition

A

500 Rem/hr at 1 meter (5 Sv)

40
Q

NRC Occupational dose limits:

Whole body per year

A

5 rem (50mSv)

41
Q

NRC Occupational dose limits:

Ocular lens per year

A

15 rem (150mSv)

42
Q

NRC Occupational dose limits:

Total equivalent organ dose per year

A

50 rem (500mSv)

43
Q

NRC Occupational dose limits:

Total equivalent extremity dose per year

A

50 rem (500mSv)

44
Q

NRC Occupational dose limits:

Dose to embryo over pregnancy

A

0.5 rem (5mSv), embryo can receive additional 0.5mSv/month post declaration of pregnancy

45
Q

What variance from expected dose constitutes a reportable event?

A

20%

46
Q

What two things are required for a reportable event?

A

1) Wrong drug/patient/dose(20% off) OR pt receives dose to unintended body part exceeding expected exposure by 50% if it had been administered correctly
2) Harm - defined as whole body dose >5rem or Single organ dose >50rem

47
Q

What constitutes reporting a reportable event?

A

Call NRC w/in 24 hours, written notice to NRC w/in 15 days, notify referring doc w/in 24 hours, notify patient

48
Q

What is required on receipt of radioactive materials?

A

Within 3 hours: survey package at surface at 1 meter, wipe test

49
Q

Package label: White 1

A

<0.5mRem/hr surface, essentially 0 at 1 meter

50
Q

Package label: Yellow 2

A

<50mRem/hr surface, <1mRem/hr at 1 meter

51
Q

Package label: Yellow 3

A

<200mRem/hr surface, <10mRem/hr at 1 meter

52
Q

Max yearly public exposure in uncontrolled area

A

5mSv/year

53
Q

Genetically significant dose

A

0.25 mSv

54
Q

What is the minimum luminance of diagnostic monitors per ACR guidelines?

A

The ACR has recommended a minimum luminance for grayscale monitors (50 foot-lamberts/171 cd/m^2).

55
Q

How long do you have to notify the NRC A) by phone and B) in writing of a medical event?

A

1 day

15 days

56
Q

When/how often is an ambient radiation exposure survey performed?

A

At the end of each day

57
Q

What is an isobar?

A

Same atomic mass, different number of protons (diff elements)

58
Q

What is the maximum variance allowed from prescribed dose?

A

20%

59
Q

What is cutoff for admission after I131 therapy?

A

7mR/h at one meter from chest or 33mCi of residual activity

Radiology CORE Exam (3 decks)

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