Fluke Biomedical 06-526 - Manual (Page 12)

Nuclear Associates 06-526 & 06-526-2200
Operators Manual
2-4
Be sure not to pinch or crush the cable as this may
cause an error in the readings. Keep the internal
chamber out of the radiation beam. Internal
chamber is still connected to the electrometer.
4. Using the collimator light field, adjust the field size to 15 cm (6 in) in diameter (i.e. the size of the
RAD-CHECK PLUS case).
5. Position the instrument so that the primary beam is centered on, and perpendicular to, the detector
(represented by the black disk on top of the unit). For under-table tubes, invert the RAD-CHECK
PLUS so that the detector faces the x-ray tube.
6. Press the RESET button to zero the display; make the x-ray exposure.
7. Read the exposure roentgens (R) or the exposure rate (R/min). To minimize drift effects, readings
should be recorded immediately.
When finished, turn the unit OFF before
disconnecting the cables to the remote detector.
2.4 Applications
RAD-CHECK PLUS can be used to measure radiation output as required by quality assurance
procedures. Several applications are discussed in the following paragraphs.
In each of these applications, it is important that all data pertaining to tests performed be recorded for
later comparison. Records should include the date, technique factor used, and readings obtained.
2.5 Radiographic Output (mR/mAs) Dose Measurements
1. Set up the x-ray field as follows:
a. Using the collimator light field, adjust the field size to 6 x 6 inch (15 x 15 cm). This adjustment
is equal to the size of the RAD-CHECK PLUS case.
b. Position the instrument so that the primary beam is centered on, and perpendicular to the
detector (represented by the black disk on top of the unit).
2. Select the desired x-ray technique (kVp, mA, and time).
3. Make the exposure.
4. Record the mR reading.
5. Calculate the mR/mAs value.
6. Record the value calculated in Step 5 and the technique factors selected in Step 2 (for reference at
a later date).
NOTE
WARNING