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Bushong Chapter 40
Radiobiology
| Question | Answer |
|---|---|
| List 3 types of radiation personnel monitoring devices. | TDL, OSL, film badge |
| The recommended dose limit for radiologic personnel is: | 10 mSv/yr |
| If a radiologic technologist participates in fluoroscopy, the occupation radiaction monitor should be postitioned where? | On the collar above the protective apron. |
| The following are considered advantages of a TLD over film badge? | TLD is more sensitive than a film badge, TLD is more accurate than a film badge, TLD can be worn up to a year. |
| It has been shown that during fluoroscopy, when a protective apron is worn, exposure to the collar region is approximately how many times greater than that to the trunk of the body beneath the protective apron? | 20 |
| True or False: Exposure dose and effective dose are often used interchangeably in radiology, because they have approximately the same numeric value following whole-body exposure. | True |
| What is the unit of effective dose used for radiation protection purposes? | REM |
| According to table 40-2 in Bushong's which of the following industries has the highest fatal accident rates? | Agriculture. |
| Name the three cardinal principles of radiation protection. | Time, distance, shielding. |
| The exposure cord on portable x-ray equipment must be at least how long? | 2 m or 6 ft. |
| True or False: The useful beam should never be directed toward the operating console. | True |
| An occupational radiation monitor is required if a person is likely to receive more than what fraction of the recommended dose limit? | 1/10. |
| True of False: OSL dosimeters are less sensitive than TLDs. | True |
| The highest occupational exposure of diagnostic x-ray personnel occurs during which procedures? | fluoro and mobile radiography |
| What is the DL for the fetus is for the period of the pregnancy? | 5 mSv or 500 mrem. |
| True or False: When a radiologic technologist changes employment, the total radiation exposure history must be transferred to the records of the new employer. | True. |
| What is the fraction of annual DL established for nonoccupationally exposed versus that established for the radiation worker? | 1/10 |
| True or False: The occupational radiation monitor offers no protection against radiation exposure. | True. |
| True or False: The TLD (thermoluminescence dosimeter) can't be worn longer than one month, because of possible fogging caused by temperature and humidity. | False. |
| True or False: Radiology staff should always hold patients. | False. |
| What is the lead equivalent and percentage attenuation at 75kVp of most lead aprons? | 0.5, 90 |
| Which of the following is the unit of effective dose and is used for radiation protective purposes? | rem |
| What units are radiation dose measured in? | rads or grays |
| Which units are radiation exposure measured in? | Roentgens. |
| MPD is the acronym for what? | Maximum Permissible Dose |
| Current DLs are based on which dose response relationships? | linear, nonthreshold |
| True or False: MPD is used by the NCRP, federal and state agencies as law for the recommended radiation dose limits. | False |
| DLs imply that if received annually, the risk of death would be less than 1 in ???? | 10,000 |
| True or False: Film badges can be reused. | False. |
| What does the control monitor measure? | none of the above |
| Lithium fluoride crystals are used most commonly in which personnel radiation monitoring devices? | TLD |
| True or False: It is optional to wear radiation protective apparel during fluoroscopy and mobile radiography. | False. |
| Interventional Radiologists must have what type of radiation monitoring provided for them? | Dosimeters. TDC, OSL or film badge and extremity. |
| Where should a pregnant radiologic technician position her second radiation monitor? | At waist level, under the apron. |
| True or False: If the occupational radiation monitor is worn beneath the protective apron it may record a falsely low exposure. | True. |
| What is the cumulative whole body DL? | 10mSv times age in years. |
| Attenuation by maternal tissues overlying the fetus reduces the dose to the fetus to approximately what percent of the abdominal skin dose? | 30 |
| The dose limit for radiologic personnel normally doesn't exceed what value? | 1 mSv/yr |
| In the general public, the annual dose limit for the lens of the eyes is what? | 15mSv (1500mrem) |
| The annual DL for the skin of the radiation worker is what? | 500mSv |
| Students younger than 18 years of age may not receive: | more than 1mSv/yr |
| What is occupation exposure measured in? | Millisieverts. |
| Protective apparel for radiation exposure should be at least: | .25mmPb equivalent |
| What is the DL that medical physicists use when computing the thickness of protective barriers? | 1mSv/yr |
| Which NCRP report is concerned with the implementation of the principle of ALARA? | Report no. 107 |
| BEIR is the acronym for what? | Biologic Effects of Ionizing Radiation. |
Created by:
MoMcKenna