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According to the national Council on Radiation Protection and measurements (NCRP), the monthly gestational dose-equivalent limit for embryo/fetus of a pregnant radiographer is? p. 135
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If the exposure rate to an individual standing 4.0m from a source of radiation is 10 mR/h, what will be the dose received after 20 minutes at a distance of 6 m from source? p. 135
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RADT 465: Rad Protec
ARRT review of radiation protection
| Question | Answer |
|---|---|
| According to the national Council on Radiation Protection and measurements (NCRP), the monthly gestational dose-equivalent limit for embryo/fetus of a pregnant radiographer is? p. 135 | .5mSv p. 159 |
| If the exposure rate to an individual standing 4.0m from a source of radiation is 10 mR/h, what will be the dose received after 20 minutes at a distance of 6 m from source? p. 135 | 1.48 mR p. 159 |
| What contributes most to occupational exposure? p. 137 | Compton scatter p. 162 |
| The x-ray interaction with matter that is responsible for the majority of scattered radiation reaching the image receptor (IR) is? p. 137 | Compton scatter p. 162 |
| With milliamperes (mA) increased to maintain output intensity, how is the ESE affeted as the source-to-skin distance (SSD) is increased? p. 137 | The ESE decreases p. 162 |
| How does filtration affect the primary beam? p. 139 | It increases the average energy of teh primary beam p. 165 |
| An optically stimulated luminescence dosimeter contains which of teh following detectors? p. 139 | Aluminum oxide p. 165 |
| Primary radiation barriers must be at least how high? p. 139 | 7 feet p. 166 |
| Late effects of radiation, whose incidence is dose related and for which there is no threshold dose, are referred to as? p. 141 | Stochastic p. 168 |
| The largest amount of diagnostic x-ray absorption is most likely to occur in which tissues? p. 141 | Bone p. 168 |
| Aluminum filtration has its greatest effect on? p. 143 | Low-energy x-ray photons p. 171 |
| Which acute radiation syndrome requires the largest exposure before any effects become apparent? p. 143. | Central nervous system (CNS) p. 171 |
| Isotopes are atoms that have the same? p. 145 | Atomic number but a different mass number p. 173 |
| An increase in total filtration of the x-ray beam will increase? p. 147 | Beam HVL p. 176 |
| Any wall that the useful x-ray beam can be directed toward is called a? p. 147 | Primary Barrier p. 177 |
| What contributes most to patient dose? p. 149 | The photoelectric effect p. 179 |
| In which type of monitoring device do photons release electrons by their interaction with air? p. 153 | Pocket dosimeter p. 184 |
| The primary function of filtration is to reduce? p. 153 | Patient skin dose p. 185 |
| To within what percentage of the SID must the collimator light and actual irradiated area be accurate? p. 154 | 2% p. 185 |
| The tabletop exposure rate during fluoroscopy shall not exceed...? p. 154 | 10R/min p. 186 |
| Radiation output from a diagnostic x-ray tube is measured in which of teh following units of measurement? p. 156 | Roentgen p. 188 |
| The target theory applies to? p. 157 | DNA molecules p. 189 |
| The genetic dose of radiation borne by each member of teh reproductive population is called the? p. 157 | Genetically significant dose p. 188 |
| The interaction between x-ray photons and tissue that is responsible for radiographic contrast but that also contributes significantly to patient dose is? p. 157 | The photoelectric effect p. 188 |
| What is the relationship between LET and RBE? p. 158 | As LEt increases, RBE increases. p. 190 |
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