Ch 37 Health Physics
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each of the black spaces below before clicking
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| What are the 3 cardinal principles of radiation protection? | time, distance, shielding
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| What are the main concerns of Health Physics? | Providing radiation protection for the radiation workers and the public
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| What was the 1st project the radiation physicists worked on? | The A bomb
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| How is exposure measured? | Exposure= Exposure rate X Exposure time
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| Work the problem: If a rad worker is exposed to 230 mR/hr from a radiation source. If the worker remains in that source for 36 min, What will be the total amout of occupational exposure? | Occ exposure= 230mR/hr X 36min/60 min 8280/60 = 138 mR
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| During a fluoro case or a C-arm case, what is the patient considered to be? | the point source
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| 1 TVL = _____ HVL | 3.3
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| This reminde the radiologist that a considerable amount of time has passed in a fluoro exam? | 5 min timer
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| What is a TVL? | It is the thickness of an absorber that reduces the radiation intensity to 1/10 th its original value
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| What is the effective dose? | the equivalent whole body dose
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| what is the whole body dose? | the weighted average of the radiation dose to various organs and tissues
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| Who is the NCRP? | The national council of radiation protection
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| What does the NCRP do? | Make recommendations reguarding dose limits
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| What are the dose limits based on? | A Linear, non-threshold dose responce
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| Whay would following ALARA be useful in x-ray? | Reduces occupational exposure
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| If you ________ your distance, ________ your time, then you will __________ exposure levels. | increase, decrease, decrease
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| A CT scan of the abdomen and pelvis results in 2000 mrad. How do you find the effective dose? Gonad .2, Colon .12, Liver .5 | Multiply each given factor by the total amount of dose recieved. total of 740 mrad
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| What type of radiologic device is a sealed radioactive material that directly exposes a person? | RED Radiation exposure device
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| This devices when exploded disperses radioactive contimants over a wide area? | RDD radiological dispersal device
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| This device contains nuclear material that can produce mass devistation and destruction if detonated? | IND Improvised nuclear device
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| What is the Inverse Square Law used for? | calculate the exposure and for radiation protection
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| What is the main concern for the first responder? | To prevent injury and death and to attend to the medical needs of the victims
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| Who are considered to be first responders in a radiological terrorist attack? | Police, fire dept personnel, ems, rad techs, hospital personnel
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