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RADT 465: Rad Prot
Radiation Protection
| Question | Answer |
|---|---|
| According to the NCRP, the monthly gestational dose equivalent limit for embryo / fetus of a pregnant radiographer is (pg. 135 #2) | 5 mSv |
| The interaction between ionizing radiation and the target molecule that ism most likely to occur is the (pg. 136 #8) | Indirect effect |
| What is the approximate entrance skin exposure (ESE) fir the average AP supine abdomen radiograph? (pg. 136 #9) | 300 mrad |
| What is the established annual occupational dose equivalent limit for the lens of the eye? (pg. 136 #12) | 150 mSv |
| Occupational radiation monitoring is required when it is possible that the individual might receive more than (pg. 136 #13) | 1/10 the annual dose limit |
| With mA increased to maintain output intensity, how is the ESE affected as the source to skin (SSD) is increased? (pg. 137 #20) | The ESE increases |
| Each time an x-ray beam scatters, its intensity at 1m from the scattering object is what fraction of its original intensity? (pg. 137 #22) | 1/1,000 |
| According to the NCRP, the annual dose occupational whole body dose equivalent limit is (pg. 137 #23) | 50 mSv |
| Sources of secondary radiation include (pg. 137 #25) | Leakage radiation and scattered radiation |
| The photoelectric effect is most likely to occur with (pg. 138 #27) | Absorbers having a high Z number and positive contrast media |
| Medical and dental radiation accounts for what percentage of the general public's exposure to human made radiation? (pg. 138 #34) | 90% |
| What are composed of non-diving differentiated cells? (pg. 139 #35) | Neurons and neuroglia |
| Immature cells are referred to as (pg. 139 #39) | Undifferentiated cells and stem cells |
| What is the term used to describe x-ray photon interaction with matter and the transfer of part of the photon's energy to matter? (pg. 139 #40) | Scattering |
| The annual dose limit for occupationally exposed individuals is valid for (pg. 139 #44) | Beta, x-, and gamma radiations |
| Patient dose increases as fluoroscopic (pg. 140 #46) | FOV decreases |
| What unit of measuring is used to express ionizing radiation dose to biologic material? (pg. 140 #48) | Rem (Sv) |
| Biologic material is least sensitive to irradiation under what condition? (pg. 140 #52) | Anoxic |
| According to the NCRP regulations, leakage radiation from the x-ray tube must not exceed (pg. 141 #60) | 100 mR/h |
| Diagnostic x-radiation may be correctly described as (pg. 142 #66) | Low energy, low LET |
| According to the NCRP, the annual occupational dose equivalent limit (50 rem) to the thyroid, skin, and extremities is (pg. 142 #70) | 500 mSv |
| Which type of personnel radiation monitor can provide an immediate reading? (pg. 144 #86) | Ionization chamber |
| Factors that contribute to the amount of scattered radiation produced include (pg. 144 #92) | Radiation quality and field size |
| The SSD for mobile fluoroscopy must be (pg. 145 #93) | A minimum of 12 inches |
| The automatic exposure device that is located immediately under the x-ray table is (pg. 145 #94) | Ionization chamber |
| The Law of Bergonie and Tibondeau states that cells are more radiosensitive if they are (pg. 145 #95) | Highly proliferative and immature |
| The most radiosensitive portion of the GI tract is the (pg. 146 #103) | Small bowel |
| The photoelectric effect is an interaction between an x-ray photon and (pg. 146 #105) | An inner shell electron |
| What is considered the unit of exposure in air? (pg. 147 #110) | Roentgen (C/kg) |
| Any wall that the useful x-ray beam can be directed toward is called a (pg. 147 #115) | Primary barrier |
| In the production of characteristic radiation at the tungsten target, the incident electron (pg. 149 #131) | Ejects an inner shell tungsten electron |
| The term effective dose refers to (pg. 150 #134) | Whole body dose |
| What interaction between ionizing radiation and the target molecule involves formation of a free radical? (pg. 150 #139) | Indirect effect |
| What is the approximate ESE for the average AP lumbar spine radiograph? (pg. 151 #143) | 300 mrad |
| The types of secondary radiation barriers include (pg. 151 #145) | The control booth, lead aprons, and the x-ray tube housing |
| The dose of radiation that will cause a noticeable skin reaction is referred to as the (pg. 152 #152) | SED |
| Protective devices such as lead aprons function to protect the user from (pg. 153 #164) | Scattered radiation |
| The primary function of filtration is to reduce (pg. 153 #165) | Patient skin dose |
| Radiation output from a diagnostic x-ray tube is measured in which of the following units of measurement? (pg. 197 #187) | Roentgen |
| According to the NCRP, the pregnant radiographer's gestational dose equivalent limit for a 1 month period is (pg. 157 #193) | 0.5 mSv |
| The target theory applies to (pg. 157 #195) | DNA molecules |
Created by:
rdwilliams1
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