Random board questions/equations

1/2 C-12

1 amu =

hinge angle equation

180 - 2(wedge angle)

100 keV/µm

optimal LET

0.1%

shield the linac head to what percent of dose at isodose

pythagorean thereom

to calculate setup error uncertainty

late

which tissue shows less survival for high doses?

acute

which tissue shows less survival for low doses?

betatron is changing microtron is constant

betatron vs microtron magnetic fields?

reproductive death

cell death for reproductive cells

1/r^2

dose falls off as

1/r

dose of a line source falls off as

wedge factor formula

dose with wedge/dose without wedge

1/Tb + 1/Tp = 1/Teff

effective half life equation

E/2

electron practical range (Rp)

Independent

exposure -> Gy in air independent or dependent of energy?

Restoring electrons in the crystal lattice to the ground state

Annealing of TLDs

focal spot - sin∅

Apparent focal spot equation

nd x (1+d/α/β)

BED equation

Charge liberated in the gas of an ion chamber

Bragg-Gray relationship

loss of function

Cell death for static cells

at least dmax

How big does the buildup cap distance need to be

Blocks

Do blocks or MLCs have a higher primary beam transmission?

H=DxQ

Dose equivalent formula

BED/(1+2/α/β)

EQD equation

Farmer chamber

Example of a thimble type chamber

Free-air chamber

Example of absolute dosimeter

cGy

KERMA is measured in

3.5 - 4 Gy

LD5-/60 without medical care

on film/on skin

Magnification factor

(PDD2/PDD1) = ((SSD2+dmax)(SSD1+d)/(SSD2+d)(SSD1+dmax))^2

Mayneord F factor

Dhypoxic/Daerobic

OER

2-3

OER for most cells types for photons/electrons

log(Io/It)

Optical density formula

s(SSD+d-SDD)/SDD

Penumbra equation

3%

Precision of TLDs?

938 MeV

Proton rest mass

PDD at 10cm

Quality of MV photon beam

Dstandard radiation/Dtest radiation

RBE

Sv

SI unit for dose equivalent

SMR = TMR(fs) - TMR (0x0)

SMR and TMR relationship

(voxel activity/mass)/(decay corrected injected activity/body mass)

SUV equation

((273+T)/293)(760/P)

T/P correction

it doesn't require calibration

What does an absolute dosimeter mean?

beam energy density of absorber atomic number of absorber

What does linear attenuation coefficient depend on?

surface dose

What is a use of thin window parallel plate chambers?

gold/lead

What is scattering foil made of

512 kB

What is the size of a CT image?

Establish electronic equilibrium

What's the purpose of a buildup cap?

early responding tissues

alpha/beta large for

late responding tissues

alpha/beta small for