NUCS Flashcards by Ryan Bailey

Tc99m (T1/2 and Energy)

6hrs

140 keV

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Tc99m (Prod and Decay)

Generator

Isomeric Transition

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Xe 133 (T1/2 and Energy)

5.3 days

81 keV

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Tl 201 (T1/2 and Energy)

73 hours

69-81 keV

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In-111 (T1/2 and Energy)

67 hours

172/247 keV

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Ga-67 (T1/2 and Energy)

78 hours

90, 190, 290 keV

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I-123 (T1/2 and Energy)

13 hours

159 keV

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I-131 (T1/2 and Energy)

8 days

364 (G) and 606 (B)

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F18 (T1/2 and Energy)

110 minutes

511

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Max Mo in Tc? Term?

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

Radionuclide purity

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Max Al contamination in Tc? Term?

<10 mcg Al per 1mL

Chemical purity

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How can aluminum contamination show up on a

1) free Tc scan
2) Sulfer Colloid scan

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

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

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

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Formula for effective half life

1/Eff = 1/Phys + 1/Biol

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

Lower energy tracer first to prevent downscatter from muddying the picture

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

Extrinsic is daily and includes the collimator

Intrinsic is weekly and does not use collimator

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How often is gamma camera energy window tested?

Daily

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How often is gamma camera linearity tested?

Weekly

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How often is gamma camera center of rotation tested?

Monthly

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How often is gamma camera spatial resolution tested?

Weekly

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

100mR/h

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What is the detectable range for an ionization chamber?

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

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What type of instrument is a dose calibrator?

Ionization chamber

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

5%, daily

How frequently is linearity for a dose calibrator checked?

Quarterly

How frequently is accuracy for a dose calibrator checked?

At installation and annually

How frequently is dose calibrator geometry checked?

At installation and anytime the device is moved

What constitutes a major spill of Tc99?

100mCi

What constitutes a major spill of Tl-201?

100mCi

What constitutes a major spill of In-111?

10mCi

What constitutes a major spill of I-123?

10mCi

What constitutes a major spill of Ga-67?

10mCi

What constitutes a major spill of I-131?

1mCi

Gy=rad=rem=mSv

1 Gy = 100 rad/rem = 1 Sv

Annual dose limit for public

100mRem

Unrestricted area max dose

2mRem/hr

Radiation area definition

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

High radiation area definition

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

Very high radiation area definition

500 Rem/hr at 1 meter (5 Sv)

NRC Occupational dose limits: | Whole body per year

5 rem (50mSv)

NRC Occupational dose limits: | Ocular lens per year

15 rem (150mSv)

NRC Occupational dose limits: | Total equivalent organ dose per year

50 rem (500mSv)

NRC Occupational dose limits: | Total equivalent extremity dose per year

50 rem (500mSv)

NRC Occupational dose limits: | Dose to embryo over pregnancy

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

What variance from expected dose constitutes a reportable event?

20%

What two things are required for a reportable event?

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

What constitutes reporting a reportable event?

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

What is required on receipt of radioactive materials?

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

Package label: White 1

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

Package label: Yellow 2

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

Package label: Yellow 3

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

Max yearly public exposure in uncontrolled area

5mSv/year

Genetically significant dose

0.25 mSv

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

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

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

1 day | 15 days

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

At the end of each day

What is an isobar?

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

What is the maximum variance allowed from prescribed dose?

20%

What is cutoff for admission after I131 therapy?

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