-
What organizations provide reports and recommendations?
UNSCEAR AND ICRP
-
WHAT ORGANIZATION REGULATES THE DESIGN AND MANUFACTURE OF X-RAY EQUIPMENT
FDA
-
THE MINIMUM FIELD SIZE AT 100 cm MUST NOT BE LESS THAN OR EQUAL TO:
5X5 cm
-
EXPOSURE FROM A FLUOROSCOPIC UNIT THAT IS NOT DIRECTED TO THE IMAGE RECEPTOR MUST BE LESS THAN _______ mR/hr at 10 cm.
2
-
IN NO CASE MAY A MOBILE C-ARM BE OPERATED AT LESS THAN ____ cm SOURCE-TO-SKIN DISTANCE.
20
-
AN AREA WHERE THE RADIATION LEVEL COULD REACH 60 mrem/hr WOULD BE CLASSIFIED AS A
RADIATION AREA
-
WHAT TERM IS PREFERRED OVER MPD (MAXIMUM PERMISSIBLE DOSE)?
DOSE EQUIVALENT LIMITS
-
A 30 YEAR-OLD RADIATION WORKER WOULD BE ALLOWED, UNDER NEWER STANDARDS (NCRP REPORT NO. 91), ___ rem WHOLE-BODY CUMULATIVE EXPOSURE.
30
-
IF HOLDING A PATIENT, ANY AREA OF THE BODY STRUCK BY THE BEAM MUST BE COVERED WITH ___ mm OF LEAD EQUIVALENT.
0.5
-
A TOTAL OF 500 mrem TO THE MOTHER (OCCUPATIONAL EXPOSURE) WOULD BE EQUIVALENT TO ABOUT ___ mrem TO THE FETUS.
10
-
TRUE OR FALSE
THE ANNUAL RADIATION DOSE LIMIT FOR THE GENERAL PUBLIC IS SET NOT TO EXCEED 1 mSV (100 mrem) for continuous or frequent exposure.
TRUE
-
TRUE OR FALSE
THE ANNUAL RADIATION DOSE LIMIT FOR THE GENERAL PUBLIC IS SET NOT TO EXCEED 5 mSV (500 mrem) FOR INFREQUENT EXPOSURE.
TRUE
-
THE RADIATION DOSE TO THE EMBRYO OR FETUS OF A PREGNANT RADIATION WORKER IS RESTRICTED TO RADIATION EXPOSURE OF NO MORE THAN:
500 mrem and 50 mrem per month
-
The principle behind ALARA states that:
Exposure of personnel to any radiation source should be kept as low as reasonably achievable considering the economic and social aspects.
-
True or False
The annual maximum permissible dose to the lens of the eye (general public) is 5 rem.
True
-
True or False
The level of dose limit for minors (under 18) is lower than that for grown adults.
True
-
The maximum dose allowed to a fetus/embryo of a radiation worker is set at 0.5 rem and 0.05 rem/month
True
-
true or false
the annual maximum permissible dose to the whole body (radiation worker) is 5 rem.
True
-
The three basic principles that guide radiation protection are:
Time, distance, shielding
-
True or False
Personnel monitoring radiation badges are to be worn at all times during the pregnancy while performing any radiation-related duties.
True
-
True or False
Personnel monitoring radiation badges for nonpregnant women should be worn either on the collar or the abdomen or both.
True.
-
Who can be a radiation saftey officer?
radiologist, rad. oncologist, rad therapist, diagnostic tech w/ advanced training
-
what are other terms for the saftey health officer?
health physicist, medical physicist, radiation saftey officer
-
True or False
a single photon can cause damage.
True
-
Name some regulatory agencies and what do they do?
NRC - US Nuclear Regulatory Commission - establishes regulations and standards for protection against radiation hazards.
EPA - US Environmental Protection Agency - development and enforcement related to the control of radiation in the environment.
FDA - US Food and Drug Administration - regulates the design and manufacture of electronic products and performs spot compliance checks
-
Describe/Define
Shall
Should
Shall means you will do it! Mandatory
Should means they recommend it, but is not mandatory
-
Regulations
Beam Quality
- Measured in HVL
- 30-50 kVp minimum 0.3-1.2 HVL
- 50-70 kVp minimum 1.2-1.5 HVL
- 70-up kVp minimum 1.5-4.1 HVL
-
Regulations
Reproducibility of the beam and timer mechanism
Must terminate exposure at a consistent exposure
single phase 2 pulse - spinning top
- 120 x seconds = # of dots
- timer mechanism
-
HVL and energy have what type of relationship?
direct. if energy goes up HVL goes up
-
Regulations
Linearity of mA stations
- must be within 10%
- checked by making 10 exposures at 2 consectutive settings within 1 hour
-
Regulations
Beam collimation and alignment
x-ray field must allign to center of IR within 2% SID (+ or - 2%)
PBL must not allow field size to exceed IR size greater than 3% of SID
-
What are the special requirements for fluoro?
- Protective barrier must limit leakage radiation to 2 mR/hr at 10 cm.
- Max rate of 10 R/min, should not exceed 5 R/min.
- SOD must be no less than 15" for stationary, and 12" for portable/mobile
- Audible timer must indicate 5 minutes of exposure
-
State Licensure of RTs
- ARRT certification is VOLUNTARY
- statistics show that as many as half of operators are not certified
- studies show certified operators provide better patient protection (1 reason why some states have
- adopted licensure)
-
Radiation Saftey Program
Who directs the saftery program?
What programs should it involve?
RSO - radiation saftey officer
- a. objectives
- b. tissues at risk
- c. risk assessment
- d. maximum permissible dose equivalent
- e. training
- f. minimizing exam exposure
- g. reducing repeats
- h. pregnant patients
- i. all aspects of protection of personnel and patients
-
What are the barrier types?
Primary - designed to attenuate radiation resulting from the primary beam.
Secondary - designed to attenuate radiation resulting from leakage or scatter radiation.
-
work areas
unrestricted - exposure same as background exposure - no requirements
restricted - radiation area 5-100 mrem/hr
controlled access
radiation area sign
HIGH RADIATION AREA - MORE THAN 100 mrem/hr
requires door interlocks
-
what are the examples of personnel monitoring devices
Film badge - 2 pieces of film in light tight paper, plastic holder w/ series of filters, reading of film density will indicate exposure levels.
Thermoluminescent Dosimeters (TDL) calcium fluroide with manganese, stores energy from exposure until heated.
-
when must monitoring occur?
when dose expected to recv 10% of dose equivalent limits
-
Occupational Exposure
effective dose limits are:
annual at 5 rem
cumulative at 1 rem x age
-
occupational exposure
tissue and organs
lens of the eye 15 rem
skin, hand, feet 50 rem
-
occupational exposure
non-rad workers
10% of occupational limits (1.5 mrem)
-
Fetal Dose
Duration of pregnancy
Per month
DOP = .5 rem
PM = .05
-
Negligible Individual Risk Level
(new concept)
1 mrem
-
Exposure control
occupational exposure only involves exposure form performing ones job
does not mean diagnostic procedure performed on the tech (do not wear badge then)
-
Control booth
walls
exposure switch
design
- walls minimum of 7 feet high
- exp. switch - cannot be reached when in the room
- booth design so photons must scatter at least 2x before reaching behind protective barrier
-
protective garments
other than patient
primary beam .5 mm lead
scatter .25 mm lead
for fluoro must use primary barrier - apron must be .5 mm thick
-
Holding patients/film
mechanical device first choice
- last resort - human - prefer male relative of patient
- must be shielded by .25 mm lead
if pt. holds film, must shield using .5 mm lead
-
pregnant patient
questions
- LMP
- pregnancy test
- signs instructing to edu tech that u r pregnant
- 10 day rule
- 28 day rule
-
define
10 day rule
28 day rule
10 day - within 1st 10 days of onset menustration
28 day - within 28 days of last onset menustration
-
pregnant employees
- exposure is limited to .5 rem for duration of pregnancy
- or
- .05/month
declaration is voluntary
|
|