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RADT 111 End of Chapter Review Questions for 1 & 2 (Week 1)
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RADT 111 End of Chapter Review Questions for 1 & 2 (Week 1)
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RADT 111 End of Chapter ReviewQuestions for 1 & 2 (Week 1)
Who is credited with the discovery of x-rays and when? - ANS-Dr. Wilhelm Conrad
Röentgen is credited with the discovery of x-rays; on November 7, 1895, he was
experimenting with his Crookes tube in his basement laboratory when he unintentionally
stumbled upon the phenomenon by means of noticing a plate on the opposite side of
the room "glowing".
Who discovered fluoroscopy and when? - ANS-In 1896, Thomas Edison developed a
new invention he called a Vitascope: it consisted of a handheld Crookes tube with a
screen at one end and an eyepiece at the other. This invention was unknowingly the
first fluoroscope and the forerunner of all modern fluoroscopy tubes.
Who was the first known American fatality from radiation exposure? -
ANS-Unfortunately, Thomas Edison's close friend and assistant was the first known
American fatality from radiation exposure. Known as Clarence Dally, he suffered
immensely from ailments such as hair loss, loss of fingers and both hands, and overall
constant pain before passing away in 1904.
Who discovered radium? - ANS-Maire Pierre Curie discovered radium in 1898, and said
discovery was met with much public anticipation as upper crust members of high society
turned to throwing radium parties in celebration (which consisted of dimming the lights
and admiring the glow-in-the-dark ability of their radium-laced drinks!)
What does ALARA stand for? - ANS-The term ALARA stands for 'As Low as
Reasonably Achievable', which refers to the concept that must be utilized when striving
to meet protection standards; the three parts of this concept include time, distance, and
shielding.
What type of tube was used when x-rays were discovered? - ANS-When x-rays were
discovered, a tube referred to as a Crookes tube was being utilized by Dr. Wilhelm
Conrad Röentgen throughout his cathode ray experiments.
Why was the letter "X" used to name x-rays? - ANS-Dr. Wilhelm Conrad Röentgen
deemed the term "x-ray" appropriate simply due to the fact that he was unsure of what
exactly he had produced and from that drew inspiration for the name from the
mathematical symbol for the unknown (which is "x").
, Which of the following are modern day advances that came from x-ray? - ANS-A few
modern-day advances that came from x-ray include SPECT (single-photon emission
CT), PET (positron emission tomography), Ultrasound, Mammography, and CT
(computer tomography).
What were the early uses of x-ray? - ANS-Some early uses of x-ray technology include
hair removal, cocktail parties, souvenirs, and spiritual connections
What law describes the relationship between intensity of the beam and distance from
the source? - ANS-The inverse square law states this by illustrating that the intensity of
the radiation is inversely proportional to the square of the distance of the object from the
source.
What is better for patient protection: collimation, or cropping of the digital image? -
ANS-? In regards to patient protection, collimation is much more proactive and
beneficial as it reduces scatter, increases contrast, and provides a more quality image
than one that has the collimation open to the size of the image receptor. Cropping of the
digital image occurs after the exposure has already taken place; therefore, it will not
reduce the amount of radiation the patient receives and is not an effective way of
protecting a patient.
What is the annual radiation dose limit for radiology students under the age of 18? -
ANS-0.1 rem (1 mSv)
What is the annual radiation dose limit for the general public? - ANS-0.5 rem (5 mSv)
What is the annual radiation dose limit for occupational workers? - ANS-5 rem (50 mSv)
What is the radiation dose limit for pregnant workers within in a nine month period? -
ANS-0.5 rem (5 mSv)
What is the radiation dose limit for pregnant workers within any given month? -
ANS-0.05 rem (0.5 mSv)
What is the minimum thickness used for lead aprons, gloves, and thyroid shields? -
ANS-In accordance with guidelines, all shields must be no less than 0.25 mm of lead
(as shields of this lead weight will absorb 97% of all radiation below kVp.
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