Radiation Quantities Flashcards
1 amp = _____
1 amp = 1 Coulomb sec-1
1 watt = _____
1 watt = 1 Joule sec-1
1 eV = _____ ergs
1 eV = 1.6 x 10-12 ergs
1 eV = _____ Joules
1 eV = 1.6 x 10-19 Joules
1 Å (angstrom) = _____ m
1 Å (angstrom) = 10-10 m
1 inch = _____ cm
1 inch = 2.54 cm
1 ft = _____ cm
1 ft = 30.48 cm
1 u = _____ kg
1 u = 1.66 x 10-27 kg
1 u = _____ MeV
1 u = 931.5 MeV
1 Ci = _____ dps
1 Ci = 3.7 x 1010 dps
1 Ci = _____ dpm
1 Ci = 2.22 x 1012 dpm
1 R = ______ C kg-1
1 R = 2.58 x 10-4 C kg-1
1 rad = _____ J kg-1
1 Gy = _____ J kg-1
1 rad = 0.01 J kg-1
1 Gy = 1 J kg-1
1 rad = _____ MeV g-1
1 rad = 6.242 x 107 MeV g-1
1 rad = _____ erg g-1
1 rad = 100 erg g-1
1 R = _____ ergs g-1 of air
1 R = 86.9 ergs g-1 air
* based on 33.7 eV/ion pair
1 R = _____ ergs g-1 of soft tissue
1 R = 98 ergs g-1 soft tissue
* based on 33.7 eV/ion pair
1 dpm = _____ pCi
1 dpm = 0.45 pCi
1 day = _____ sec
1 day = 86,400 sec
1 day = _____ min
1 day = 1,440 sec
1 year = _____ sec
1 year = 3.15 x 107 second
What does exposure measure?
The ability of photons to produce ionizations in air.
Three major limitations for the use of the roentgen
- The roentgen applies only to photons.
- The roentgen applies only in air.
- The roengten is defined only for E<3MeV
Define
Absorbed Dose
- Unit: rad (“Roentgen Absorbed Dose”)
- Measures the energy which is actually deposited in some given mass.
- One rad is equivalent to 100 ergs of energy deposited per gram of material.