RADT 1200 Test 1 Questions with Correct Answers
Patient dose for each exam varies because? - Answer--different equipment
-differences in procedure
-technical skills
Amount of radiation received by patient may be expressed by? - Answer-1. Entrance Skin Exposure (ESE)
2. Bone Marrow dose
3...
RADT 1200 Test 1 Questions with
Correct Answers
Patient dose for each exam varies because? - Answer--different equipment
-differences in procedure
-technical skills
Amount of radiation received by patient may be expressed by? - Answer-1. Entrance
Skin Exposure (ESE)
2. Bone Marrow dose
3. Gonadal dose
And sometimes 4. Fetal dose (only in women)
T or F- humans (can) control the amount of natural background radiation - Answer-false;
cannot
T or F- the number of medical procedures involving ionizing radiation has increased
dramatically since the 1980's - Answer-true
T or F- exposure of U.S. population from medical sources has (decreased) - Answer-
false; increased
Accounts for 48% of total EfD of U.S. population as of 2006 - Answer-diagnostic x-ray
and nuc. med
What was the main reason for increase in the EfD of the population in 2006? - Answer-
expanded use of CT
Medical radiation accounts for how many millisieverts of ionizing radiation received? -
Answer-3.2 mSv
peak kilovoltage (kVp) controls: - Answer--quality
-penetrating power
milliamperage-seconds (mAs) controls: - Answer--quantity
-mA x s = mAs
x-rays can do 1 of 3 things in a patient - Answer-1. can be absorbed
2. can be scattered
3. can pass through unaffected
absorption - Answer-electromagnetic energy is passed from x-ray photon to atoms of
patient
, absorbed dose (D) - Answer-the amount of energy absorbed per unit mass
the more electromagnetic energy that is absorbed in the patient, the (blank) the
possibility of biological damage in patient - Answer-greater
anode (target) - Answer-usually made of Tungsten or Tungsten alloy
why use of tungsten and/or tungsten alloy for target material? - Answer--high melting
points
-high atomic numbers
Permanent inherent filtration - Answer-Combination of the x-ray tube glass wall and the
added aluminum used to filter out the lower energy photons
primary radiation - Answer-filtered x-ray photon beam after it has left the x-ray tube
kVp and kV refer to voltage on what? - Answer-x-ray tube
keV refers to energy of what? - Answer-specific x-rays
attenuation - Answer-reduction in the number of primary photons in x-ray beam through
absorption and scatter as the beam passes through the patient in its path
direct transmission - Answer-primary x-ray photons traverse patient without interacting
radiographic image receptor can be: - Answer--phosphor plate
-digital IR
-film
what is radiation - Answer-transfer of kinetic energy, or energy of motion, from one area
to another
what are ions - Answer-altered atoms or molecules comprising particles -give charge
What is ionizing radiation? - Answer-radiation is applied to the object or person and
electrons are ejected
The goal of modern radiation protection programs is to protect persons from both? -
Answer-short term and long term radiation effects
radiation protection - Answer-effective measures employed by radiation workers to
safeguard pts., personnel, and the general public from unnecessary exposure to
ionizing radiation
3 main types of quantities for measuring radiation: - Answer-1.exposure
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