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The Observer USB reads in Total Counts, CPM, CPS, μR/hr, mR/hr, μSv/hr and has the ability to collect, log the
data received, calibrate the unit, and echo the readings collected on a PC. The data is displayed on a graph as
well as a digital on-screen meter and can be saved or printed in various ways, including a spreadsheet format.
USB.
Connect to The Inspector
mini-B type jack located on the side of the Inspector above the Output Figure 2 (9). To connect the Inspector,
power on your detector, plug the cable into the USB jack, and connect the other end to the USB port on your
connected.
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Detector
Internal Halogen-quenched, uncompensated GM tube with thin mica window, 1.4-2.0 mg/cm2 areal density.
center of the detector.
Averaging Periods
Display updates every 3 seconds. At low background levels, the update is the average for the past 30-second
ENERGY RESPONSE
5
RELATIVE
COUNTRATE
Operating Range
mR/hr - .001 (1μR) to 100
CPM - 0 to 350,000
μSv/hr - .01 to 1000 CPS - 0 to 5000
Total Counts (Total/Timer) - 1 to 9,999,000 counts
Accuracy (Cs137)
mR/hr ±10% typical (NIST), ±15% max - 0 to 100
μSv/hr ±10% typical (NIST), ±15% max - 01 - 1000
CPM ±10% typical (NIST), ±15% max - 0 to 350,000
Energy Sensitivity
End Window
Side Wall
4
3
2
1
0
101
102
103
104
PHOTON ENERGY (keV)
approx. 25%. Detects Gamma down to 10 KeV through the end window. 3340 CPM/mR/hr (Cs137). Smallest
detectable level for I125 is .02 μCi at contact.
Display
4 digit liquid crystal display with indicators. Display updates every 3 seconds.
Alert Set Range
are used for mR/hr / CPM, and μSv/hr / CPS. Alarm will sound when in Timer Mode when set alarm threshold
is reached.
Count Light
Audio Indicator
Outputs
Dual miniature jack drives CMOS or TTL devices and counts to computer or datalogger.
Anti-Saturation
Power Requirements
Temperature Range
-10ºC to 50ºC (14ºF to 122ºF)
Weight
Size
150 x 80 x 30 mm (5.9 x 3.1 x 1.2 in.).
Includes
Options
Xtreme Boot, Wipe Test Plate, & Stand
Limited Warranty
1 year limited warranty.
27
How can I use the Inspector USB to detect radiation in food and water?
A Geiger counter is a "Yes or no and how much" type of detector. They cannot determine the
distribution of the incident radiation energy, so they cannot identify which potential isotopes are
present. To identify specific isotopes, a radiation spectrum analyzer with a sensitive enough scintillation
detector for the application would be necessary. Geiger counters are ideal for basic screening, especially
if you do long timed counts and, in most instances, will give you an indication regarding foods that are
significantly contaminated.
When using a Geiger counter to test food, you should take into consideration that the meter is likely
missing a bit of the radiation. This is due to the shielding of the radiation by the density of food, and the
limitations posed by the detection range of the meter. Alpha radiation can be detected on the food's
surface, but can be blocked if there is internal contamination. You can better test food by grinding it into
a paste and taking a timed count. This may give an indication that you have contamination in your food,
though it will not qualify what type of radiation may be present in the sample.
Water and food can also be a shield for radiation, so unless there is gamma radiation our instruments
are not the most ideal without a little processing of the material in question (beta and alpha will not
move very far in water and will be shielded by it). You can take a sample of the water and run it through
a filter and test the filter or you can evaporate it down and test the swipe on an Inspector USB with a
Wipe Test Plate, however, the URSA-II with the appropriate detector would be much more efficient for
this application, but scintillation based instruments are more expensive than the handheld GM based
alternatives. Regardless, most of the higher energy betas and gamma radiation that falls within the
sensitivity of the detector will be measured.
It is important to remember to establish a background count prior to surveying your samples. To do this,
use your Inspector in the Timed Count mode and take a background count of at least 10 minutes. Then,
divide the total counts displayed on the unit by the number of minutes of your count. For instance, if
you take a 10 minute timed count, divide the total counts by 10. If you're taking a 24 hour background
count, then divide the total by 1440 (the number of minutes in a 24 hour period) to get your Counts Per
Minute background level. The longer you take a timed count, the more statistically accurate your
reading will be. You will then subtract that amount from the readings of your sample.
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