RAD 102 - Radiation Science exam 2 questions and answers
2024 University of Nevada, Las Vegas
How do we detect radiation? - Ionization and excitation
What are the 2 steps to radiation detection - radiation causes
ionization/excitation
ionization/excitation converted to a signal
What are gas-filled detectors - geiger-muller tubes
ion chambers
what are scintillation detectors - plastic scintillators
sodium iodide (NaI) detectors
what are physical effect detectors - radiographic film
optically-stimulated luminescence (osl)
Gas filled detectors detect - measures current created
Remember the W-value? - average energy required to produce an ion pair in a
material
, For air, W = - 34 eV/ion pair
exposure = - ions produced in air
what is the SI Unit for ions produced in air - SI unite = C/kg (coulombs per kg air)
Exposure is defined only for - photons in air!
1 Roentgen (R) = - 2.58 x 10^-4 C/kg
What are the three major types of gas fill detectors - ionization
proportional counters
geiger-mueller detectors
Changing voltage changes - detection limits
information available
electron multiplication. As V increases - electrons accelerate
what is produced if electron is accelerated enough, it causes ionization then
producing... - a second electron
2024 University of Nevada, Las Vegas
How do we detect radiation? - Ionization and excitation
What are the 2 steps to radiation detection - radiation causes
ionization/excitation
ionization/excitation converted to a signal
What are gas-filled detectors - geiger-muller tubes
ion chambers
what are scintillation detectors - plastic scintillators
sodium iodide (NaI) detectors
what are physical effect detectors - radiographic film
optically-stimulated luminescence (osl)
Gas filled detectors detect - measures current created
Remember the W-value? - average energy required to produce an ion pair in a
material
, For air, W = - 34 eV/ion pair
exposure = - ions produced in air
what is the SI Unit for ions produced in air - SI unite = C/kg (coulombs per kg air)
Exposure is defined only for - photons in air!
1 Roentgen (R) = - 2.58 x 10^-4 C/kg
What are the three major types of gas fill detectors - ionization
proportional counters
geiger-mueller detectors
Changing voltage changes - detection limits
information available
electron multiplication. As V increases - electrons accelerate
what is produced if electron is accelerated enough, it causes ionization then
producing... - a second electron
