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27 Cards in this Set
- Front
- Back
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3 factors RNI is usable in NM: |
1. Same chemicle properties to its stable isotope- follows the same physiologic pathways. 2. Emits gamma radiation 3. Tag to physiologic compounds chemically to radionuclide |
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Graph of line of stability; Above the line = ? |
Above line: neutron excess, below line, neutron deficiency |
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Line of Max stability, at low Z, N = ? |
Low Z, Z = N |
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Three types of decay process |
Alpha, Beta, Positron |
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4 Types of Primary Decay |
Alpha, Beta, Position, Electron Capture |
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3 types of Secondary Decay |
Gamma, Isometric Transition, Conversion Electron |
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Alpha decay, What is released |
1-6 MeV mm/cm in air Highly ionising 4He2 |
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Beta decay, Energy Range Ionisation What is released |
3 MeV cm/m in air Moderately ionising 0e-1 |
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Positron decay, Reaction When will it occur |
Internal pair production Electron remained in nucleus, positron emited Occurs when there is too few neutrons in nuclei, N value below the stability belt. |
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Electron capture, How does it happen What is released |
K-shell capture, characteristic radiation released electron disappears and a proton in the nucleus become neutron, releasing gamma and neutrino |
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Isometric transition, What is isometric transition |
A transition from metastable state ( isomer ) |
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Internal conversion, What is emitted |
Energy of gamma ray given to electron, escapes from atom. Characteristic radiation is emitted. |
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Isobars, Isotopes,Isotones,Isomers,Isodiapheres |
Same A, same Z, same N, same A and Z, having excess number of N |
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Chart of nuclides; Gray represents what? Question mark? |
stable/long half-lives, naturally occuring, fission products, uncertain |
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Activity formula and definition |
number of radioactive nuclei that disintegrate in a sample per unit time. At =A0e^-Lt, L = Lamda |
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What are the SI unti for disintegration rate |
Bq and Ci |
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1 Ci = ? Bq |
3.7 x 10^10 dps |
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Physical half-life formula |
T = 0.693/L |
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Effective half- life? |
Radiation dose patient will recieve |
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Biological half-life? |
Time taken for the radionuclide to be excreted from the body. |
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Photon energy of radionuclide allowed for NM |
50 - 500 keV |
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Average/mean life |
Average lifetime of all the atoms in the given sample and is defined as the ratio of the total lifetime of all the atoms to the total number of atoms. |
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Half life of: Tc-99m I-123 I-131 TH-201 |
6 h 13 h 8 days 73 h ` |
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What is the ideal energy for gamma camera to pick up |
150 keV |
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What are the 4 mechanisms for localising radiopharmaceuticals? |
Phagocytosis (Bone, spleen, liver), Diffusion( kidney), Capillary blockade, metabolism (thyroid) |
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2 types of generator and their differences |
Dry and wet type Dry- inconvenient, less impurites, easier to maintain Wet- convenient, more impurities, hard to keep sterility |
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3 routes of administration |
IV Oral Inhalation |
