DMI 100 Review Radiation Protection
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. What would you like to do?
how many percent does natural background radiation account for human exposure?
what is the greatest source of exposure to humans? how many percent?
name the different types of natural background radiation
name the different types of natural man made radiation
- consumer products
how many percent does man made radiation account for human exposure?
how many rads are in 1 gray?
1 Roentgen equals how many coulomb per kg?
2.58 x 10-4 C/kg
1 curie equals how many becquerels?
3.7 x 1010 becquerels
What does ICRP do?
- international commision on radiological protection
- conducts research and provides recommendations on radiation protection
what does NCRP do?
- national council on radiation protection
- formulates and publishes research recommendations in the U.S.
what does the NRC do?
- nuclear regulatory commission
- enforces radiation protection standards
what does a linear-threshold graph look like and represent?
- the line starts to the right of zero
- this means any radiation to the left (lower doses) will have no response
- when that threshold is exceeded, the response is directly proportional to the dose recieved
- for ex cataracts
what does a non linear threshold graph look like and represent?
- curved graph starting to the right of zero
- indicates that no response at lower doses (to the left of the graph)
- when that threshold is exceeded, the response is not directly proportional
linear non threshold represents what?
- no level of radiation is safe
- the degree of response to exposure is directly proportional to the amount of radiation recieved
what does non linear non threshold graph represent?
- no level of radiation can be safe
- response is not directly proportional to the amount of radiation recieved
what are stochastic effects?
randomly occuring effects of radiation
what are non stochastic effects or deterministic effects?
effects that become more severe at high levels of radiation and do not occur below a certain threshold
what is the occupational dose limit to the lens of the eye?
what is the occupational dose limit to the skin, hands and feet?
what is the annual dose limit for the general public with frequent exposure?
what is the annual dose limit for the general public with limited exposure?
what is the occupational dose limit to the embryo-fetus
what is the total equivalent dose for the embryo during gestation?
what is the equivalent dose for the embryo per month?
what is the level of negligible risk to radiation?
1 mrem per year
what is the minimum source-to-skin distance for portable radiography?
at least 12 inches
what is the source-to-tabletop distance for fixed fluoroscopes?
not less than 15 inches
what is the source-to-tabletop distance for portable fluoroscopy? what is perferred?
- not less than 12 inches
- 15 inches perferred
what is gsd?
- genetically significant dose
- if recieved by the entire population, would cause the same genetic injury as the total of doses recieved by the members actually being exposed
- the average gonadal dose to the childbearing-age population
how much lead does a radiographer have to wear? how much should they wear
- must wear at least 0.25mm lead
- should wear 0.5mm lead
how thick does lead have to be for primary barriers?
how high does the wall that gets hit by a primary beam have to be?
how thick does lead have to be for secondary barriers?
how much overlap does a primary protective barrier over a secondary protective barrier be?
x-ray control booth is considered as a primary or secondary protective barrier?
what kind of material does an OSL use to record dose?
the OSL is sensitive to how low of radiation?
What kind of material does a TLD use to record dose?
lithium fluoride crystals
the TLD is sensitive to how low of radiation?
What kind of material does a film badge use to record dose?
film badges measure dose as low as?
uncontrolled areas' effective dose limit to the general public is how many rem?
controlled areas' effective dose limit to the general public is how many rems?
how is workload calculated to determine lead thickness?
- mA min/wk
- volume and types of exam performed in the room
how thick does the bucky slot cover be?
how thick does the protective curtain have to be?
What would you like to do?
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