ABR Part 2 ACTUAL UPDATED QUESTIONS AND CORRECT ANSWERS

ABR Part 2 ACTUAL UPDATED
QUESTIONS AND CORRECT ANSWERS
Co-60 dmax - CORRECT ANSWERS✅✅0.5cm



6x dmax - CORRECT ANSWERS✅✅1.5cm



10x dmax - CORRECT ANSWERS✅✅2.5cm



18x dmax - CORRECT ANSWERS✅✅3.5cm


% attenuation in water for:
6MV
10MV

18MV - CORRECT ANSWERS✅✅6MV=3%/cm
10MV=2.5%/cm
18MV=2%/cm


Electron attenuation in AIR - CORRECT ANSWERS✅✅2%/cm
105 to 110 SSD change in output ~10%


Electron attenuation in WATER and LEAD - CORRECT ANSWERS✅✅2MeV/cm for
Water
2MeV/mm for Lead


Electron range in Cerrobend compared to lead - CORRECT ANSWERS✅✅1.2xPb


Photon contamination of electrons for
6E
12E

, 20E - CORRECT ANSWERS✅✅6E=1%
12E=2%
20E=5%


Tissue Density for
Lung
Fat
Muscle

Bone - CORRECT ANSWERS✅✅Lung=0.3g/cc
Fat=0.95g/cc
Muscle=1.03g/cc
Bone=1.65g/cc


HU values for
Lung
Fat
Muscle

Bone - CORRECT ANSWERS✅✅Lung= -700HU
Fat= -100HU
Muscle= 50HU
Bone= 700HU


Dead time of GM Tube - CORRECT ANSWERS✅✅~50-100 microseconds



GammaKnife prescribes to what isodose line - CORRECT ANSWERS✅✅50%



CyberKnife prescribes to what isodose line - CORRECT ANSWERS✅✅70-90%


What size of source would produce a smaller penumbra

(Large or small source?) - CORRECT ANSWERS✅✅Small source, smaller penumbra