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What are the three cardinal priciples of radiation protection?
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To calculate exposure, mulitply ______x______.
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Rad Bio Exposures
| Question | Answer |
|---|---|
| What are the three cardinal priciples of radiation protection? | Time- Distance- Shielding |
| To calculate exposure, mulitply ______x______. | Exposure rate x exposure time |
| If a technologist is receiving 400mR/hr standing 2ft from the pt, what is the rate when he steps back to 6ft? | 44mR/hr |
| One tenth value layer=____half value layers | 3.3 |
| What organization makes recommendations regarding dose limits? | NCRP-national council on radiation protection and measurements. |
| Dose limits are based on what type of dose response relationship? | Linear, nonthreshold |
| Calculate the recommended cumulative lefretime exposure for a 38 year old technologsit. | 1 rem x age in years = 38 rem |
| the pregnant patient can be radiographed______. | if it is known and documented. |
| What agency is responsible for enforcing radiation safety standards? | NRC- nuclear regulatory commission |
| Students under 18 should not exeed and effective dose limit of ____ anuually. state in Rem & mSv | 0.1 Rem or 1 mSv |
| What is the annual occupational effective dose that applies to radiographers? rate in Rem and mSv | 5 Rem or 50 mSv |
| If the intesity of radiation at 72" SID is 6 mR/mAs, what is the intesisty at 120 kVp at a distance of 40 SID? | 19.44 mR |
| a fluoroscope emits 2 R/ma-min at the table top. What is the appox entrance skin exposure after a 4.5 min fluoro exam performed at 3mA? | 27 R |
| What is the effective dose of an examination of the abdomen/pelvis if the average tissue dose is 2000 mRad? Weighting factors; colon .12, stomach .12, gonads .2, skin .01, livier .05 | 1000 mRad |
| if jamie is positioned 2 ft from the fluoro table and teh exposure rate is 9.6mR/hr, what is her total exposure if she stands there for 23 min? | 3.68 mR |
| State the former MPD formula | MPD= 5 (N-18) rem |
| once a pregnancy is declared, the monthly dose equivalent lmit is _____ Rem. | 0.05 Rem/month |
| The fetus in utero may not exceed more than ___ Rem from occupational exposure. | 0.5 Rem |
| Where should the pregnant technologist wear the second radiation monitor after declaring her pregnancy? | under the lead apron at the waist level. |
| What do the initials ALARA stand for and explain it. | As Low As Reasonable Achievable. Keep occupational and nonoccupational exposures as low as possible. |
| The HVL for an xray machine at 90 kVp is 0.2 Pb. If the original intensity is 3.8 mR/mAs, how thick does the lead have to be to decrease the intensity to <0.3mR/mAs? | 4HVL, or 0.8mm Pb |
| What is the effective dose equivalent limit for the skin/extremities per year? state in Rem and mSv | 50 Rem/year or 500 mSv/year |
| The recommended exposure limits for the general public not occupationally exposed is: ______ for continuous (frequent) exposures, and ______ for infrequent annual exposures. | 0.1 rem or 1 mSv frequent 0.5 rem or 5 mSv infrequent |
| What is the "ten day rule"? | Elective exams of the abdomen/pelvis should be performed within 10 days after the onset of menses. |
| A survey meter reads 32 mR/hr. How long can a technologist stay before receiving a dose of 56 mR? | 105 mins |
| Whole body dose | 5 rem/yr or 50 mSv/yr |
| Lens of the eye | 15 rem/yr or 150 mSv/yr |
| Organ and skin/extremities annual dose | 50 rem/yr or 500 mSv/yr |
| Dose during Pregnancy | 0.5 Rem or 5 mSv |
| Declared pregnancy | 0.05 Rem/month or 0.5 mSv/month |
| cumulative dose | 1 rem or 10 mSv x age in years |
| Public exposure (infrequent) | 0.5 rem/yr or 5 mSv/yr |
| Public exposure (frequent) | 0.1 rem/yr or 1 mSv/yr |
| Students under 18. | 0.1 rem/yr or 1 mSv/yr |
Created by:
rieste