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Definition
| absorbed dose (j/kg); originally “rad” |
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Definition
now called Gy
measurement of absorbed energy from radiation |
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Definition
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0.7/% decay per day
Tc-99 HL is 6 hours |
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Term
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Definition
Describes attenuation
absorbance directly related to concentration |
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Term
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Definition
Energy
20-120 for X-ray/CT
140 for Tec99
Outershell e- are only a few eV |
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Definition
| measures air ionization produced by radiation or “radiation output” |
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Term
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Definition
Sv
EqDose = Wr x Dose
(Wr is radiation weighing factor which is 1 for common diagnostic radiation) |
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Definition
Sv
EfDose = SUM (Wt x organ dose)
Does NOT depend on distance! |
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| Dose Length Product (DLP) |
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Definition
measure of ionizing radiation to the pt from CT
DLP = CTDI x length of scan |
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Term
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Definition
| Radiation exposure from a CT |
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Definition
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Term
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Definition
half-life of daughter is shorter than half-life of parent
Occurs in 4 half lives |
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Term
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Definition
production rate of an isotope equals the decay rate
Half-life of daughter is much less than half-life of parent, basically negligible
Occurs in 6 half-lives |
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Definition
| measurement of biologic damage from radiation |
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Term
| Kinetic Energy Released in Media |
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Definition
| Represents kinetic energy transferred from uncharged particles to charged particles |
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