Raphex Flashcards
Isomer
Metastable nucleus
Isobar
Same amount of nucleons
Isotone
same amount of neutrons
Isotope
same amount of protons
wavelength of xray
e=hc/L
Directly ionizing radiation is caused by
CHARGED particles (not neutrons of photons)
temperature korrection
(temp in kelvin)/(reference temp in kelvin)
Pressure korrection
(Reference pressure)/(pressure)
define rtg
1rtg=0.873cGy in air. different dose for rest of the materials. depend on compound of the material and the x-ray spectrum.
whats optical density?
log[(incident light intensity)/(transmitted light intensity)]
what is transient equilibrium
Transient equilibrium is a situation in which equilibrium is reached by a parent-daughter radioactive isotope pair where the half-life of the daughter is shorter than the half-life of the parent. EX generators
Secular Equilibrium
Secular equilibrium can only occur in a radioactive decay chain if the half-life of the daughter radionuclide B is much shorter than the half-life of the parent radionuclide A. In such a situation, the decay rate of A, and hence the production rate of B, is approximately constant but B is slightly larger,
beta -
n=>p + e+ antineurino
beta +
p=>n + positron + neutrino
EC
p+e=n+ neutrino
why EC and not beta+
In proton-rich nuclei where the energy difference between initial and final states is less than 2mec2, β+ decay is not energetically possible, and electron capture is the sole decay mode.[3]
HVL
half value layer. HVL=ln(2)/u
what is specificity
TN/(TN+FP)
what is Sensitivity
TP/(TP+FN)
HU calculation
1000 x (u_water-u_material) /u_water
