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Radiology RISE Exam Questions & Answers 2024/2025
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Radiology RISE Exam Questions & Answers 2024/2025 Absorbed dose - ANSWERSenergy imparted by ionizing radiation per unit mass of irradiated material. The units of absorbed dose are the rad and the gray (Gy). Activity (units) - ANSWERSActivity is the rate of disintegration (transformation) or...

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  • September 1, 2024
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  • 2024/2025
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Radiology RISE Exam Questions &
Answers 2024/2025

Absorbed dose - ANSWERSenergy imparted by ionizing radiation per unit mass of irradiated material.
The units of absorbed dose are the rad and the gray (Gy).



Activity (units) - ANSWERSActivity is the rate of disintegration (transformation) or decay of radioactive
material. The units of activity are the curie (Ci) and the becquerel (Bq).



Airborne Radioactivity Area - ANSWERSA room, enclosure, or area in which airborne radioactive
materials exist in concentrations:

1) In excess of derived air concentrations (DACs)

2) To such a degree that an individual present in the area without respiratory protective equipment
could exceed, during the hours an individual is present in a WEEK, an intake of 0.6% of the annual limit
on intake (ALI) or 12 DAC-hours.



ALARA principle - ANSWERS(acronym for "as low as reasonably achievable) A principle that means
making every reasonable effort to maintain exposures to radiation as far below the dose limits as is
practical



Annual Limit on Intake (ALI) - ANSWERSLimit of radioactive material taken into the body that would
result in the smaller of a committed effective dose equivalent of 5 rems (0.05 Sv) or a committed dose
equivalent of 50 rems (0.5) Sv to any individual organ/ tissue



Assigned protection factor (APF) - ANSWERSLevel of workplace protection that a properly functioning
respirator would be expected to provide.



Can be estimated by dividing the ambient airbone concentration by the APF.



APF 10 = inhale 1/10 of contaminants

, Atmosphere Supplying Respirators - ANSWERSRespirator that supplies the user with an air supply from a
source independent of the ambient atmosphere.



Includes supplied-air respirators (SARs) and self-contained breathing apparatus (SCBA) units.



Bioassay - ANSWERSThe process of determining the kinds, quantities, location (distribution) or
concentrations of a radioactive material in the human body, whether directly (in vivo counting) or by
analysis and evaluation of materials excreted or removed from the human body



Byproduct material - ANSWERSAny radioactive material, except special nuclear material, yielded in or
made radioactive by, exposure to the radiation incident to the process of producing or utilizing special
nuclear material.



Collective dose - ANSWERSIs the sum of the individual doses received in a given period of time by a
specified population from exposure to a specified source of radiation.



Committed Effective Dose Equivalent (CEDE) - ANSWERSsum of the products of the weighting factors
applicable to each of the body organs or tissues that are irradiated and the committed dose equivalent
to these organs or tissues



Committed Dose Equivalent (HT,50) - ANSWERSThe dose equivalent to organs or tissues of reference (T)
that will be received from an intake of radioactive material by an individual during the 50 year period
following the intake.



Constraint (dose constraint) - ANSWERSa value above which specified licensee actions are required



Controlled Area - ANSWERSan area, outside of a restricted area but inside the site boundary, access to
which can be limited by the licensee for any reason



critical group - ANSWERSthe group of individuals reasonably expected to receive the greatest exposure
to residual radioactivity for any applicable set of circumstances

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