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
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