Unit 1 163 Pima Word Scramble
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Question | Answer |
We are continually exposed to natural background radiation. Natural background includes... | radiation from radioactive materials in nature and radiation from outer space |
When does thermionimic emission occur... | when the tungsten filament is heated |
dental x-ray is produced when... | high speed electrons strike a target |
x-rays are... | ionizing, electromagnetic radiation |
Accourding to the inverse square law, the intensity of radiation is ______ proportional to the _____ from the source of radiation... | inversely, square of the distance |
____ speed film is currently the fastest intraoral film available | F |
the production of x-ray energy is dependent upon | heating the anode, heating the tungsten filament, and small focal spot |
What is the max permissible dose (MPD) in a calendar year to which radiation workers may be exposed... | 5.0rems/year(.05 silverts/year) |
operator of dental x-ray equipment are limited to ____ per 4/4 or(13 week period)... | 1.25 rems |
material that resist the penetration of x-ray the most... | lead |
what type of x-rays are best able to penetrate body tissue... | hard rays of short wave length |
Increasing kvp of dental x-ray machine produces... | greater penetrating power |
the purpose of a film badge (dosimeter) is to... | measure amount of radiation received by operator and measure the type of radiation received by the operator |
The purpose of filtering the x-ray beam is... | to remove soft or low energy x-rays |
the quantity or number of x-rays produced is determined by... | milliamperage and exposure time |
Most radiosensitive... | bone marrow |
collimation of the primary beam... | reduces the size of the beam |
When the target film distance is doubled, what happens to the intensity of the x-ray beam... | the beam will be 1/4th as intense |
John stands three feet away from the tube head when taking radiographs. Janelle stands six feet away. What is difference in the amount of radiation received by John... | John receive four times the amount of radiation |
In dental radiology, what is the purpose of the added aluminum filter... | to remove the longer, less penetrating x-ray from primary beam |
The Control switch should be located at least____ feet away from the tube head or should have a cord length sufficient... | 6 feet |
After the x-ray machine is turned off x-rays to bounce about the room... | never they stop instantly |
the recommended beam diameter is collimated to... | 2.75 in |
proper collimation of the primary beam will reduce... | secondary radiation, and radiation recevied by patient |
a collimator for dental x-ray machine is usually made of what material... | lead |
radiation injuries that do not appear in the person irradiated but occur in future generations are called... | genetic effects |
during pregnancy the greatest danger to the fetus is during... | the first trimester |
the factors that does not effect the amount of radiation injury... | the type of film used |
organs in the head and neck which are believed to be sensitive to the x-ray are... | thyroid and lense of eye |
what is most effective in reducing radiation exposure to the patient... | fast film |
the comulative effects of x-rays on living material means... | each successive additional radiation exposure may an increasing damaging effect and damage from radiation is never completely repaired |
Radiographs absorbing materials (protective barriers) known to be most effective are... | Lead, concrete, or two 5 x 8" thickness of gypsum board |
In normal dental radiographic procedures the hazard to the operator is from... | Secondary or scattered radiation |
The earliest visible sign to the skin from overexposure to radiation is... | an erythema |
The unit used to measure the dose equivalent of radiation exposure is termed... | sievert (Sv) or Rem (roentgen equivalent in man) |
monitoring devices might be worn by operators of x-ray equipment to measure radiation exposure... | film badge or dosimeter |
the most effective way to reduce gonadal radiation for a dental patient is to use... | a leaded lap apron |
least radiosensitive (least sensitive to x-rays)... | muscle cells |
________ is the damaging bio-chemical change in living tissues which results from exposure to x- radiation... | ionization |
all dental personnel should use the concept of______ for radiation protection... | ALARA |
A radiograph is too dark (overexposed). The cause could be... | excessive milliamperage (too much mA) and excessive exposure (too much time) |
the thinkness of the aluminum filter on an x-ray machine that operates above 70kVp is... | 2.5mm thick |
the differences between shades ranging from black to white in adjacent area of the radiograph is termed... | contrast |
dental radiographs legally belong to | the dentist because the patient is paying for the diagnosis |
position indicating devices (PID) that is least effective in reducing scatter radiation | pointed plastic cone |
a radiograph with low contrast may be produced by... | increasing kVp |
which of the following PID length would produce a radiograph with better detail, definition, and the least image magnification... | 16 inches |
which term describes the white areas on the processed radiograph... | radiopaque (roentgen-opaque) |
the yearly Maximum Permissible Dose (MPD) allowed pregnant radiation workers, the general public, and radiation workers under the age of 18 is... | 0.1 R per year |
who is the only person who should be in the path of the primary beam... | the patient |
Created by:
Urania
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