physics2
Terms
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- equ eV in 1 amu
- 931 MeV
- Formula E (MeV) from wavelength
- 1.24/lambda
- define isotone
- same n, diff Z
- define isobar
- same A, diff Z
- define isomer
- Diff energy state, metastable, same Z
- SI unit activity
- 1 Bq
- number dps in 1 Ci
- 3.7 10^10
- Mode decay high atomic number > 82
- alpha decay
- range KE alpha particles
- 5 - 10 MeV
- particles emitted in beta minus decay
- electron and antineutrino
- particles emitted beta plus decay
- positron and neutrino
- define negatron emission
- excessive num n or high n/p, result fission, beta minus decay
- high n/p results in this decay
- beta minus or negatron
- particle responsible for cont spectrum in beta decay
- neutrino/antineutrino
- Low n/p ratio results in this decay
- Positron emission, beta plus decay
- define electron capture
- orbital electron captured by nucleus, transforming proton to neutron
- The electron capture decay competes with this decay
- Positron decay
- Electron decay used to change n/p how?
- To increase this ratio
- this decay follows electron capture and why
- gamma decay, release of excess energy
- shell most involved in electron capture and why
- K shell, closest to nucleus
- characteristic and secondary x-rays emitted in electron capture from...
- Auger electrons
- Describe Auger electrons
- Internal PE effect, monoenergetic e produced when electrons cascade lower orbits
- Attenuation as %/cm for 6 MV photons
- 3.5% / cm
- Factor that most influences change in PDD with SSD
- ISF
- Factor that most influences PDD with change in depth
- Attenuation
- Skin dose increases with increasing
- field size
- Skin dose increases with decreasing
- SSD, energy
- Compared with 6 MeV electrons, superficial x-rays... negatives
- have higher skin dose, more dose to tissue
- Compared with 6 MeV electrons, superficial x-rays... positives
- require less shielding, sharper penumbra
- Yellow I?
- 50 mrem or less at surface, TI does not exceed 1 mrem at 1 m, else Yellow 2!
- Which radiation transport label does not require TI?
- White I
- daily qa linac
- output 3%, lasers and ODI 2 mm