Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
RADT 456 rad prot.
ARRT reg review
| Question | Answer |
|---|---|
| What type of dose response curve used to predict stochastic effects is the | linear nonthreshold |
| A dose of 0.25 Gy or 25 rad to the fetus during the 3rd/4th week of pregnancy is more likely to cause _____ _____ | skeletal anomalies |
| What is the effect on relative biologic effectiveness(RBE) as LET decreases | RBE decreases |
| How does filtration affect primary beam | filtration increases average energy of primary beam |
| The principal function of -ray beam filtration is to | reduce patient skin dose |
| Patient dose can be decreased by using | high-speed film and screen combination |
| Each time an x-ray photon scatters, its intensity at 1 meter from the scattering object is what fraction of its original intensity | 1/1000 |
| Guidelines used to reduce personnel and/or patient dose in fluoroscopy; 1)..... 2)..... | 1)maximum tabletop intensity 10R/min 2)minimum filtration 2.5 mm Al equivalent |
| Primary radiation barriers must be at least how high | 7 feet |
| The operation of personal radiation monitoring devices can depend upon 1.....2..... | 1)ionization 2)thermoluminescence |
| What type of crystals are used in an optically luminescent dosimetry system | aluminum oxide |
| The unit of measurement used to express occupational exposure is the | Rem/Sievert |
| Exposure rate to individual standing 4 m from a source of radiation 10mR/h, what will be the dose received after 20 min at a distance of 6 m from the source | 1.48 mR |
| The interaction between ionization radiation and the target molecule that is most likely to occur is the | indirect effect |
| What is the established annual occupational dose-equivalent limit for the lens of the eye | 150 mSv |
| Occupational radiation monitoring is required when it is possible that the individual might receive more than | 1/10 annual dose limit |
| Source of natural background radiation contributing to whole-body radiation dose include 1 & 2 | 1)terrestrial radionuclides 2)internal radionuclides |
| What are used to account for the differences in tissue characteristics when determining effective dose to biologic material | tissue weighting factors |
| The exposure rate to the body 4 ft from the source of radiation is 16 R/h. What distance from source would be necessary to decrease the exposure to 6 R/h | 7 ft |
| A thermoluminescent dosimetry system would use what crystal | lithium fluoride |
| The photoelectric effect is more likely to occur with; 1..... 2..... | 1)absorbers having high Z number 2)positive contrast media |
| What anomalies are possible if an exposure dose of 40 rad(400mGy) were delivered to a pregnant uterus in the 3rd week of pregnancy | organ anomaly |
| Medical and dental radiation accounts for what percentage of the general public's exposure to human-made radiation | 90% |
| Patient dose increases as fluoroscopic | FOV decreases |
| What unit of measure is used to express ionizing radiation dose to biologic material | Rem(Sv) |
| For exposure to 1 rad of ionizaing radiations, what would result in the greatest dose to the individual | internal source alpha particles |
| Biologic material is least sensitive to irradiation under what condition | anoxia |
| The reduction in the intensity of an x-ray beam as it passes through material is termed | attenuation |
| According to NCRP regulations, leakage radiation from the x-ray tube must not exceed | 100 mR/h |
| What most effectively can minimize radiation exposure to the patient | high-speed intensifying screens |
| Primary radiation barriers usually require ___ thickness of shielding | 1/16 in lead |
| According to the NCRP, the annual occupational dose-equivalent limit(50 rem) to the thyroid, skin, and extremities is | 500 mSv |
| What is the intensity of scatter radiation perpendicular to and 1 m from the patient compared with the useful beam at the patient's surface | 0.1% |
| The amount of time that x-rays are being produced and directed toward a particular wall is referred to as the | use factor |
| What typeof personnel radiation monitor can provide an immediate reading | ionization chamber |
| The law of Bergonie and Tribondeau states that cells are more radiosensitive if they are 1..... 2..... | 1)highly proliferative 2)immature |
| The most radiosensitive portion of GI tract is the | small bowel |
| What body parts are included in whole-body dose 1.....2..... | 1)gonads 2)blood-forming organs |
| What personnel monitoring devices used in diagnostic radiography is considered to be the most sensitive and accurate | OSL dosimeter |
| Examples of late effects of ionizing radiation on humans include | 1)leukemia 2)local tissue damage 3)malignant disease |
| What cells are most radiosensitive | erythroblasts |
| What contributes most to patient dose | photoelectric effect |
| Biologic material irradiated under hypoxic conditions is | less sensitive than under oxygenated conditions |
| Which interaction between ionizing radiation and the target molecule involves formation of a free radical | indirect effect |
| Student radiographer under 18 years old must not receive an annual occupational dose of greater than | 0.1 rem (1 mSv) |
| 3 types of secondary radiation barriers include | 1)control booth 2)lead aprons 3)x-ray tube housing |
| Somatic effects of radiation refer to effects that are manifested | during life of exposed individual |
| The dose of radiation that will cause a noticeable skin reaction is referred to as the | SED |
| Somatic effects resulting from radiation exposure can; 1..... 2..... | 1)have possible consequences on exposed individual 2)cause temporary infertility |
| Protective devices such as lead aprons function to protect the user from | scattered radiation |
| The tabletop exposure rate during fluoroscopy shall not exceed | 10 R/min |
| 3 things that are considered radiosensitive tissues | 1)bone marrow 2)intestinal crypt cells 3)erythroblast |
| The correct way to check for cracks in lead aprons is to | fluoroscope them once a year |
| The target theory applies to | DNA molecules |
| Where have sources of radon exposure been identified | 1)indoors, in houses 2)smoking cigarettes |
Created by:
dlsilberbe
Popular Radiology sets