Term
| types of radiation detectors |
|
Definition
radiographic film
gas filled detectors
ionization chamber
Geiger Muller counter
scintillation detectors
TLD |
|
|
Term
| for ____ the degree of darkening is a meausre of radiation quantity |
|
Definition
|
|
Term
limited range
sensitivity
energy dependent
temperature and humidity
exposure cannot be determined on day of occurance |
|
Definition
| limitations of radiographic film |
|
|
Term
| two principle applications of radiographic film |
|
Definition
making radiograph
personnel radiation monitor |
|
|
Term
radiation ionizes atoms in its path
the electrons released are detected as a signal, and the signal is proportional to the radiation intensity |
|
Definition
|
|
Term
| in gas filled detectors, the larger the chamber the ___ gas molecules are available for ionization |
|
Definition
|
|
Term
| when the chamber is more pressurized, __ sensitivity will be present |
|
Definition
|
|
Term
| high sensitivity means that |
|
Definition
| the instrument can detect very low levels of radiation intensity |
|
|
Term
|
Definition
| the instrument can precisely detect AND measure the intensity of radiation |
|
|
Term
| accuracy is controlled by the |
|
Definition
| overall design (esp electronic design) |
|
|
Term
| used for pocket dosimeters and portable field surveys for >1mR/hr |
|
Definition
|
|
Term
| ionization chambers provide accurate exposure measurements for ___ and ___ energies below ___ |
|
Definition
|
|
Term
| ionization chambers are used in vicinity of patients containing ____ quantities of _____, to measure level of radiation outside ____, and to measure output intensity of ____ |
|
Definition
therapeutic, radioactive materials
protective barriers
diagnostic xray machines |
|
|
Term
fairly expensive
readings must be carefully obtained
must be read each day
subject to discharge from mechanical shock
no permanent legal record |
|
Definition
| limitations of ionization chambers |
|
|
Term
| used in stationary, portable surveys, and in laboratories |
|
Definition
|
|
Term
| Geiger Muller can detect and indicate ____ |
|
Definition
|
|
Term
| geiger muller counters are limited to less than _____ |
|
Definition
|
|
Term
| the amount of light emitted is proportional to the amount of energy absorbed by crystals, light is "collected" by the PM tube, which converts light flashes into electrical pulses |
|
Definition
|
|
Term
| scintillation detectors can be __ or __ |
|
Definition
|
|
Term
| scintillation detectors are very ___, and can detect low energy beta emissions from ___ and ____ |
|
Definition
sensitive
carbon-14
tritium |
|
|
Term
| ____ are used to monitor prescence of contamination and low levels of radiation |
|
Definition
|
|
Term
| the excited electrons absorb and store energy, which are released when the LiF crystals are heated and appear in form of visible light, which is proportional to the amount of radiation which interacted with the crystals |
|
Definition
| Thermoluminescent Detectors |
|
|
Term
| TLD measures the amount of _____ through the release of energy when the crystals are ____ |
|
Definition
|
|
Term
|
Definition
Personnel and patient dosimetry
stationary area monitoring |
|
|
Term
|
Definition
high initial cost
readouts must be carefully obtained
no permanent legal record of exposure |
|
|
