PRM-7000 / 8000 / 9000 Users Guide | 31
The following is the procedure that Mazur Instruments follows when scanning food for
radiation. This procedure is not represented as the best, most thorough or least error
prone approach.
1. Prepare a test area to place the food. Do not place the food on any
stone, granite, metal or other surface that could itself be partially radio-
active. Plastic or glass will likely be the best choice.
2. Establish an accurate background measurement baseline for the test
area by placing the PRM Instrument in the area and reconfi rming the
background radiation measurement. (See “14.1.2 Measuring Back-
ground Radiation”)”)
3. Remove the food from any packaging and place the food in the test
area.
4. Always point the sensor window or crosshair towards the food and at
a distance that is as close as practical without touching the food. Use
appropriate shims as required, and avoid placing the instrument in a
plastic bag.
5. Perform an initial scan of the entire food item by slowly moving the de-
tector across the item in an even and steady manner while maintaining
the same sensor distance from the item. Note any obvious increases in
the beep or LED-blink rate of the PRM Instrument.
6. If desired, use a timed-measurement of at least 10 minutes as a sec-
ondary way to detect radiation that may have been missed using the
initial scan. Note any amount of radiation measured above that of the
established background baseline of step 2 above.
14.6 Measuring Liquids
When measuring liquids with the PRM Instrument, use the following guidelines:
1. Orient the PRM Instrument across a suitable drinking glass or beaker
with the sensor window over the liquid. The PRM Instrument should
rest in a stable manner across the edges of the glass.
2. Establish an accurate background measurement baseline for the test
container by placing the PRM Instrument over the container and recon-
fi rming the background radiation measurement. (See “14.1.2 Measur-
ing Background Radiation”)0”)
3. Fill the sample liquid as close to the top of the container as pos-
sible exercising care not to bring the liquid in contact with the PRM
Instrument. If only a small amount of the liquid is available, locate an
appropriately sized container as required.
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