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what's the need for detectors and dosimeters
measurement of effects (direct or indirect), that can be interpreted as a value as a psychical dose rate- link back to effects of radiation.
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name the types of detectors
ionisation chambers, thimble chambers, iontomat chambers (equipment output), Geiger muller tubes
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what are the two chemical devices (CD)
film, thermoluminiscent devices dosimeters (TLDS)
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what are the electrical diodes used
MOSFETS (silicon and diamond dosimeters)
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what is the purpose of radiation output monitoring
used to measure radiation output of an x ray tube, checks consistency of radiation (energy, fluence and dispersion).
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what is the purpose of a Geiger Muller detector tube
used for radioisotope gamma detection or radionuclides.
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what is the purpose of a thimble chamber detector
measures the amount of ionisation for small volume of air
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state the importance of calibration
must be calibrated for an known exposure and the secondary standard is used as a comparison against the primary.
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what is the purpose of the thermo-luminescent dosimeters (TLD)
used to measure radiation dose via crystal compounds.
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what are the compounds involved in TLD's
sensitive ones like fluoride, lithium, calcium fluoride, sulphate
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what is the purpose of photographic film
holds have filters that are able to determine the energy levels of radiation
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name some of the advantages and disadvantages of film
- advantages- easy to use, processed quick
- disadvantages- single use only, can be damaged by either water/chemicals or heat, needs a wet film processor, not tissue equivalent and dependant energy
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