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Measurement Principles & Theory
2021.5B
RTI Scatter Probe User's Manual
25
Long Exposure (>2 s)
When the measurement continues for more than two seconds, the mean signal for the last two seconds is displayed every two
seconds. When the measurement is over, the value from the second last update is displayed. This, to avoid trig off ramp effects
in the last two seconds. See graph for long exposure below.
1. Pre-trig buffer start point. The pre-trig buffer (500 ms) is in use to avoid loosing any radiation information just before trig.
2. Trig On - The measurement starts, when irradiation rate goes over the detector's lowest trig level (or is manually started).
The status LED starts flashing GREEN.
3. The signal reaches its maximum.
4. The radiation ends, i.e. it goes under the detector's lowest trig level.
5. Post-trig buffer end point.
6. If the signal has been below the trig level during Post delay (4-6), the exposure is considered finished. Final exposure readings
are calculated and displayed.
7. Restart buffer end point - During the Restart buffer the display software gets ready for a new exposure. The status LED turns
RED during Restart buffer, but may not be visible due to fast communication and thereby a very short Restart buffer.
Integrated signal - Air kerma and Ambient Dose Equivalent H*(10)
This is the integration of all signal which means the area below the curve above from point 1 to 5. During the measurement
(exposure) the currently accumulated signal (dose, etc) is updated and displayed every two seconds.
Irradiation time
The irradiation time is defined as the time between point 2 and 4 as described above.
Signal rate (dose rate and H*(10) rate)
Every two seconds the signal rate values, representing the average rate over the last two second, is updated and displayed.
When the measurement ends, point 5 above, the average values from the last complete two-second period is displayed.
Peak rate
The peak rate is the highest detected signal rate value during the entire measurement. Point 3 as described above.
HVL and Mean Energy
HVL and Mean Energy is calculated in the same window as described for Signal rate above.
Summary of Contents for Scatter Probe
Page 2: ...2021 5B RTI Scatter Probe User s Manual...
Page 3: ...RTI Scatter Probe...
Page 6: ...2021 5B RTI Scatter Probe User s Manual...
Page 8: ...2021 5B RTI Scatter Probe User s Manual...
Page 9: ...Chapter 1 Introduction...
Page 11: ...Chapter 2 Product Overview...
Page 15: ...Chapter 3 Measure...
Page 22: ...2021 5B RTI Scatter Probe User s Manual...
Page 23: ...Chapter 4 Measurement Principles Theory...
Page 27: ...Chapter 5 Hardware and Specifications...
Page 33: ...Chapter 6 Maintenance...