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BIO AND PROTECTION
CHAPTER 37
| Question | Answer |
|---|---|
| HEALTH PHYSICS IS CONCERNED WITH MINIMIZING RADIATION DOSE TO? radiation physicists, radiation workers, the public, all of the above | all of the above |
| THE FIRST RADIATION HEALTH PHYSICISTS WORKED WITH THE……atom bomb, xray tubes, ct scanners, nuclear medicine | atom bomb |
| THE THREE CARDINAL PRINCIPALS OF RADIATION PROTECTION INVOLVE? dose/shielding/exposure, exposure/shielding/alara, time/distance/shielding, alara/time/distance | time distance and shielding |
| EXPOSURE IS MEASURED BY MULTIPLYING ____________ X ______________? shielding thickness/exposure time, exposure rate/exposure time, exposure rate/shielding thickness, exposure time, distance | exposure rate x exposure time |
| IF A TECH IS EXPOSED TO 4MR FOR 45 MINUTES DURING A FLOUROSCOPY EXAM, WHAT WILL BE HERE TOTAL EXPOSURE? 1mr, 2mr, 3,mr, 4mr | 3 mr (.45/60) = .75 .75*4=3 |
| WHEN USING THE INVERSE SQUARE LAW DURING FLUOROSCOPY, THE PATIENT SHOULD BE CONSIEDERED A(N) ______________ SOURCE OF RADIATION? area, linear, round, point | point |
| IF A TECH IS RECEIVING 200MR/HR STANDING 1 FOOD FROM THE PAITNET DURING FLOURO, WHAT IS HIS RATE OF EXPOSURE WHEN HE STEPS BACK TO A DISTANCE OF 2 FEET FROM THE PT? 50mr/hr, 74mr/hr, 100mr/hr, 175mr/hr | 200/X = 2^2/1^2 = 50 |
| A TENTH-VALUE LAYER IS EQUAL TO ______ HALF VALUE LAYERS? 1.2, 3.3, 5.5, 10.0 | 3.3 |
| IF THE HVL IN A RADIOLOGY DEPARTMENT IS .25MMPB THEN HOW THICK SHOULD A SHIELD BE TO REDUCE THE TECHS EXPOSURE TO ONE FOURTH THE INCIDENT SCATTER? .125mmpb, .25mmpb, .5mmpb, 1.0mmpb | .5MM PB |
| WHAT IS THE NCRP? national council of radiation protection, national council or radiology personnel, national committee on radiation prevention, national committee on random particles | national council of radiation protection |
| THE NCRP MAKES ______REGARDING DOSE LIMITS? laws, recommendations, requirements, measurements | recommendations |
| THE DOSE LIMITS ESTABLISHED BY THE NCRP ARE DERIVED FROM _________? government laws, newspaper articles, ncrp research, beir and ncrp reports | BEIR and NSC reports |
| THE NCRP PUBLISHES ANNUAL DOSE LIMITS FOR _______ EXPOSURES. public, occupational, prenatal, all of the above | all of the above |
| DOSE LIMITS ARE BASED ON A ___________DOSE RESPONSE RELATIONSHIP TO RADIATION?nonlinear/nonthreshold, linear/nonthreshold, linear/threshold, nonlinear/threshold | linear, non-threshold |
| THE DOSE LIMIT FOR THE GENERAL PUBLIC IS __________THE DOSE LIMIT FOR OCCUPATIONAL EXPOSURE? 1/10, 1/5, 1/2, 3/4 | 1/10 |
| WHAT IS THE ANNUAL EFFECTIVE DOSE LIMIT RECOMMENDED FOR OCCUPATIONAL EXPOSURE? .5rem, 1 rem, 5 rem, 50 rem | 5 mrem |
| THE RECOMMENDED CUMULATIVE LIFETIME EXPOSURE FOR TECHNOLOGISTS IS? .1 rem x age in years, 1 rem x age in years, 10 rem, 100 rem | 1 rem x age in years |
| WHAT IS THE TOTAL DOSE LIMIT FOR THE EMBRYO AND FETUS?.01rem, .05rem, .1rem, .5rem | .5 rem |
| IT IS MOST CRITICAL TO AVOID RADIATION EXPOSURE TO A FETUS DURING THE _____OF THE PREGNANCY? third to tenth weeks, second trimester, third trimester, first two weeks | third to tenth weeks |
| THE PREGNANT PATIENT CAN BE RADIOGRAPHED_________? under no circumstances, only in the third trimester, if it is known and documentated, no more than one time | if it is known and documented |
| WHEN A TECH BECOMES PREGNANT SHE SHOULD _______? quit her job or take a leave of absence, be issued a second personnel monitoring device, be given only administrative duties, begin wearing two lead aprons | be issued a second personnel monitoring device |
| THE RECOMMENDED DOSE LIMIT FOR THE PREGNANT TECH IS ______MREM/MONTH? .5, 5, 50, 500 | 50 |
| THE CONCEPT OF EFFECTIVE DOSE ACCOUNTS FOR THE ________. different types of radiation and RBE, relative radiosensitivity of various tissues and organs, the person's distance from the source, both a/b | both a and b |
| A REASONABLE SAFEGUARD AGAINST ACCIDENTAL IRRADIATION OF A PREGNANT PATIENT WOULD BE ________?post warning signs in department, pregnancy tests for every patient, interviews with the radiologist, irradiating only women past menopause. | to post warning signs in the department |
| WHAT IS THE BEST APPROACH TO OCCUPATIONAL RADIATION EXPOSURE ? maintain the annual dose limits, follow the concepts of alara, reduce your exposure to half the ncrp dose limits, wear protective apparel at all times | wear protective apparel at all times |
| A RADIATION WORKER IS EXPOSED TO 325 MR/HR FROM A RADIATION SOURCE. IF THE WORKER REMAINS IN THAT POSITION FOR 20 MINUTES, WHAT WILL BE THE TOTAL OCCUPATIONAL DOSE EXPOSURE? | 325/60 = 5.416667 5.416667X20 = 108MR |
| IF A RADIOLOGIC TECHNOLOGISTS IS RECEIVING 400MR/HR STANDING 2 FEET FROM THE PATIENT DURING FLUORO WHAT IS THEIR RATE OF EXPOSURE WHEN THEY STEP BACK TO A DISTANCE OF 4 FEET FROM THE PATIENT | 400/X = 4^2/2^2 = 16/X=16/4 = (400X4)/16 = 100MR |
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