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51 Cards in this Set
- Front
- Back
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How much energy do you need for Beta plus decay to occur? What type of reaction occurs? |
1.02 Mev Annihilation reaction (two 511 keV photons are produced) |
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Radionucleotide therapy utilizes what type of radioactive decay? |
Beta minus decay (Y90, I131) |
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On a graph of Energy vs. Atomic Number, name the types of decay in order. |
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Isometric Transition |
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Alpha Decay |
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Electron Capture |
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Beta Plus (positron) |
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Beta Minus (negatron) |
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With regards to scintillation crystals, whats the difference between thick and thin crystals? |
Thick crystals have better sensitivity but worse spatial resolution |
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Due to Downscatter effects, which type of tracer must be imaged first: ones with lower or higher energy photons? |
Lower!
(e.g. V/Q scan: Xe has 81 keV, Tc has 140 keV energy photon peak. Image the Xe first!) |
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What is the name of the test for Field Uniformity in QC for gamma cameras? |
Flood Test |
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What is the recommended counts for a Flood Test? |
5-10 million |
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What is "dead time" for a Geiger counter and at what dose rate does this usually happen? |
When the gas chamber becomes fully ionized.
100 mrem/h |
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What dose rate range can an ion chamber detect? |
0.1 to 100 rem/h |
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What is a sodium iodine well counter good for? |
Blood, urine or wipe test samples |
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How often are the following performed on a Dose Calibrator?
1. Constancy 2. Linearity 3. Accuracy 4. Geometry |
1. Daily (measured with Cs137) 2. Quarterly (Tc decay) 3. Annually 4. Annually or when moved/broken |
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How much is a major spill of Tc-99m? |
100 mCi |
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How much is a major spill of Tl-201? |
100 mCi |
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How much is a major spill of In-111? |
10 mCi |
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How much is a major spill of Ga-67? |
10 mCi |
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How much is a major spill of I-131? |
1 mCi |
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What dose limits constitute a reportable medical event? |
Wrong drug/route/patient/dose with: >5 rem to whole body (or) >50 rem to single organ |
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What would be the surface level and 1 meter radiation of a White I labeled package? |
Surface: <0.5 mrem/hr 1 meter: none |
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What would be the surface level and 1 meter radiation of a Yellow II labeled package? |
Surface: <50 mrem/hr 1 meter: <1 mrem/hr |
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What would be the surface level and 1 meter radiation of a Yellow III labeled package? |
Surface: >50 mrem/hr 1 meter: >1 mrem/hr |
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How much 99-Mo is allowed in a sample of 99m-Tc at the time of administration? |
Max 0.15 uCi of Mo per 1 mCi (1,000 uCi) of Tc |
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What is the limit for Aluminum in 99m-Tc dose? |
Less than 10 ug per 1 mL |
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What would liver activity on a bone scan, or lung activity on a sulfer colloid (liver/spleen) scan mean? |
Aluminum contamination |
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What would gastric, salivary or thyroid uptake mean on a bone scan? |
Too much free Tc |
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How is radionuclide purity tested? |
Dose calibrator with shields |
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How is chemical purity tested in nuclear medicine? |
pH paper (colorimetry) |
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How is radiochemical purity tested? |
Thin layer chromatography |
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The liver/spleen is the Critical Organ for what radiotracers? |
Indium I-131 MIBG Sulfur colloid (IV) |
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The gallbladder wall is the Critical Organ for what radiotracer? |
HIDA |
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The spleen is the Critical Organ for what radiotracers? |
Octreotide Damaged (heat treated) RBCs |
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The renal cortex is the Critical Organ for what radiotracers? |
Thallium DMSA |
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The proximal colon is the Critical Organ for what radiotracers? |
Sulfer colloid (oral) Sestamibi |
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The stomach is the Critical Organ for what radiotracer? |
Pertechnetate |
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The distal colon is the Critical Organ for what radiotracer? |
Gallium |
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The bladder is the Critical Organ for what radiotracers? |
MAG3 DTPA I-123 MIBG MDP FDG |
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High glucose levels, dose extravisation, and truncation artifact all cause PET SUV to be artificially low or high? |
Low |
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How often should a Normalization Scan be done for a PET machine? |
Monthly |
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How often should a Blank Scan be done for a PET machine? |
Daily (blank slate) |
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How often to perform controlled area radiation surveys of ambient radiation? |
Daily |
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How often to perform uncontrolled area radiation surveys of ambient radiation? |
Weekly |
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How often to perform controlled area wipe tests? |
Weekly |
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How often to perform uncontrolled area wipe tests? |
Monthly |
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What is negatron emisson?
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Conversion of a neutron to a proton
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What is positron emisson?
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Conversion of a proton to a neutron
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How are the half-life and physical decay constant related?
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Inversely
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How long after a CT w/contrast should you wait to give therapeutic I-131 to a patient?
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3-4 weeks (iodine must undergo organification in the thyroid)
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