ARRT Exam Practice
Units of radiation absorbed in the air? - CORRECT ANSWER-Gya
The change in the x-ray beam as it travels through a patient? - CORRECT ANSWER-attenuation
photon tissue interaction that makes radiology possible because of it's creation of contrast? -
CORRECT ANSWER-photoelectric interaction (fully absorbed = contrast)
Unit of radioactivity? - CORRECT ANSWER-becquerel
unit of effective dose? - CORRECT ANSWER-Sievert
Linear energy transfer ... - CORRECT ANSWER-varies for different types of radiation
unit of Bq would be used in what imaging modality? - CORRECT ANSWER-Nuclear medicine
graphs that show relationship between radiation received and the organisms response? -
CORRECT ANSWER-dose-response relationship
Medical x-rays are examples of? - CORRECT ANSWER-artificially produced radiation
Cataractogensis does not occur at low levels of radiation exposure; it is best expressed by? -
CORRECT ANSWER-threshold dose-response relationship
Increased dose equals increased probability of effects best describes which of the following? -
CORRECT ANSWER-Stochastic effects (probability)
The cumulative occupational exposure for a 22 year old radiographer is? - CORRECT
ANSWER-220 mSv (agex10=_____mSv)
The annual effective dose limit for the general public, assuming frequent exposure is? -
CORRECT ANSWER-1.0 mSv FREQUENT EXPOSURE
Secondary protective barrier must be at least how thick? - CORRECT ANSWER-Secondary = 1/32
Pb equivalent
Primary= 1/16 Pb equivalent
The intensity of the scattered beam is 1/1000 the intensity of the primary beam at a _______ angle
1 meter from the patient? - CORRECT ANSWER-90 degree angle
The minimum source to skin distance for a fixed fluoro is? - CORRECT ANSWER-15 inches
(fixed)
12 inches (mobile)
, Use of FEMALE gonadal shielding reduced dose by what percent? - CORRECT ANSWER-50%
95% for Males
Cells that are oxygenated are more susceptible to radiation damages describes: - CORRECT
ANSWER-Oxygen enhancement ratio
Blood count depressed after a whole body dose equvilant of at least how many rads - CORRECT
ANSWER-.25 Sv
Highly reactive ions with unpaired electrons in their outer shell are called? - CORRECT
ANSWER-Free radicals
the master molecule that directs cell activities is? - CORRECT ANSWER-DNA
Process of SOMATIC cell division is? - CORRECT ANSWER-Mitosis
The most common effect from exposure to ionizing radiation is? - CORRECT ANSWER-Nothing --
most common effect
Most radiation induced damage to cells occurs? - CORRECT ANSWER-From background
radiation
Radiation doses up to _______ are considered relatively low risk to the embryo and fetus. -
CORRECT ANSWER-.20 mSv
Cell that is relatively insensitive to radiation is? - CORRECT ANSWER-Nerve cells
Are caused by a large dose of HIGH-LET radiation to a large area of the body. - CORRECT
ANSWER-Somatic effects of radiation
Best way to keep radiation dose low to a patient is? - CORRECT ANSWER-Sheilding
Damage to the cell being irradiated is called: - CORRECT ANSWER-somatic
Radiation effects that present themselves in the next generation are called: - CORRECT
ANSWER-genetic
Radiation contained in the environment is called: - CORRECT ANSWER-Natural background
BACKGROUND RADIATION is the source of approximately what percent of human exposure? -
CORRECT ANSWER-50%
Units of radiation absorbed in the air? - CORRECT ANSWER-Gya
The change in the x-ray beam as it travels through a patient? - CORRECT ANSWER-attenuation
photon tissue interaction that makes radiology possible because of it's creation of contrast? -
CORRECT ANSWER-photoelectric interaction (fully absorbed = contrast)
Unit of radioactivity? - CORRECT ANSWER-becquerel
unit of effective dose? - CORRECT ANSWER-Sievert
Linear energy transfer ... - CORRECT ANSWER-varies for different types of radiation
unit of Bq would be used in what imaging modality? - CORRECT ANSWER-Nuclear medicine
graphs that show relationship between radiation received and the organisms response? -
CORRECT ANSWER-dose-response relationship
Medical x-rays are examples of? - CORRECT ANSWER-artificially produced radiation
Cataractogensis does not occur at low levels of radiation exposure; it is best expressed by? -
CORRECT ANSWER-threshold dose-response relationship
Increased dose equals increased probability of effects best describes which of the following? -
CORRECT ANSWER-Stochastic effects (probability)
The cumulative occupational exposure for a 22 year old radiographer is? - CORRECT
ANSWER-220 mSv (agex10=_____mSv)
The annual effective dose limit for the general public, assuming frequent exposure is? -
CORRECT ANSWER-1.0 mSv FREQUENT EXPOSURE
Secondary protective barrier must be at least how thick? - CORRECT ANSWER-Secondary = 1/32
Pb equivalent
Primary= 1/16 Pb equivalent
The intensity of the scattered beam is 1/1000 the intensity of the primary beam at a _______ angle
1 meter from the patient? - CORRECT ANSWER-90 degree angle
The minimum source to skin distance for a fixed fluoro is? - CORRECT ANSWER-15 inches
(fixed)
12 inches (mobile)
, Use of FEMALE gonadal shielding reduced dose by what percent? - CORRECT ANSWER-50%
95% for Males
Cells that are oxygenated are more susceptible to radiation damages describes: - CORRECT
ANSWER-Oxygen enhancement ratio
Blood count depressed after a whole body dose equvilant of at least how many rads - CORRECT
ANSWER-.25 Sv
Highly reactive ions with unpaired electrons in their outer shell are called? - CORRECT
ANSWER-Free radicals
the master molecule that directs cell activities is? - CORRECT ANSWER-DNA
Process of SOMATIC cell division is? - CORRECT ANSWER-Mitosis
The most common effect from exposure to ionizing radiation is? - CORRECT ANSWER-Nothing --
most common effect
Most radiation induced damage to cells occurs? - CORRECT ANSWER-From background
radiation
Radiation doses up to _______ are considered relatively low risk to the embryo and fetus. -
CORRECT ANSWER-.20 mSv
Cell that is relatively insensitive to radiation is? - CORRECT ANSWER-Nerve cells
Are caused by a large dose of HIGH-LET radiation to a large area of the body. - CORRECT
ANSWER-Somatic effects of radiation
Best way to keep radiation dose low to a patient is? - CORRECT ANSWER-Sheilding
Damage to the cell being irradiated is called: - CORRECT ANSWER-somatic
Radiation effects that present themselves in the next generation are called: - CORRECT
ANSWER-genetic
Radiation contained in the environment is called: - CORRECT ANSWER-Natural background
BACKGROUND RADIATION is the source of approximately what percent of human exposure? -
CORRECT ANSWER-50%
