FH40 Flashcards
What does the FH40GL measure solo?
Just gamma
Ceiling value for FH40?
10 REM/hr
What does the NBR-Detector FHZ 672 E do?
It detects and differentiates between natural and artificial radiation.
What happens when the red LED is on during startup?
The detector is in background learning mode for about 1 minute.
What indicates the detector is ready for use?
The green LED flashes.
What does a flashing green LED mean in normal operation?
Normal mode, no artificial radiation detected.
What does a flashing red LED indicate?
Detection of artificial radiation.
What does it mean if both LEDs are flashing?
Anomalous radiation detected, possibly from K-40 (Potassium-40).
What does the FH 40 G-Display show?
Dose rate and artificial radiation detection.
What is the check source used for HV calibration?
Cs-137 (Cesium-137).
How do you start HV calibration?
Select function CAL672 and hold the ▼ button for 3 seconds, twice.
What LED behavior occurs during calibration?
Red and green LEDs flash alternately.
When is calibration complete?
When all LEDs turn off, and the green LED flashes five times.
What must you wait for after calibration before using the detector?
The background learning mode to finish (1 minute), indicated by green LED flashing.
With blue probe what will it detect?
Alpha, beta, gamma
Ceiling value with blue probe?
100mRem/hr
Type of detector in blue probe?
NBR
Natural background rejector
What is Organic Scintillation Detection?
A radiation detection method using an organic scintillator that emits light when exposed to ionizing radiation, which is then converted into an electrical signal.
What does NBR stand for in radiation detection?
Natural Background Rejection
What is the purpose of Natural Background Rejection (NBR)?
A signal processing technique that filters out naturally occurring radiation to enhance detection of artificial gamma radiation sources.
Fill in the blank: Organic Scintillation Detection uses an organic _______ that emits light when exposed to ionizing radiation.
[scintillator]
True or False: Natural Background Rejection is used to detect naturally occurring radiation.
False
What does an organic scintillator do when exposed to radiation?
It emits light (photons)
Organic scintillators are materials that emit light in response to ionizing radiation.
What component converts the light from the scintillator into an electrical signal?
A photomultiplier tube (PMT) or a solid-state sensor
These devices are essential for converting optical signals into measurable electrical signals.
What type of radiation does organic scintillation detection primarily detect?
Gamma radiation and sometimes beta radiation
Organic scintillation detectors are particularly sensitive to high-energy photons.
How does the detector measure radiation intensity?
By analyzing the number and energy of light pulses produced
The intensity of radiation is directly related to the light output from the scintillator.
Why is organic scintillation useful for radiation detection?
It provides fast response times and good sensitivity to gamma radiation
This makes it suitable for various applications in radiation monitoring.
What is the purpose of NBR technology?
To filter out natural background radiation and focus on artificial sources
This technology is crucial for improving the accuracy of radiation detection.
What is a common naturally occurring radioactive isotope that NBR filters out?
Potassium-40 (K-40)
K-40 is a prevalent isotope found in the environment that contributes to natural background radiation.
How does NBR differentiate between natural and artificial radiation?
By analyzing the energy spectrum of detected radiation
The energy spectrum provides insights into the source of the radiation.
Why is NBR useful in radiation monitoring?
It helps reduce false alarms and improves detection of dangerous artificial radiation
This is particularly important in security and safety applications.
What types of artificial radiation can NBR help identify?
- Cesium-137 (Cs-137)
- Cobalt-60 (Co-60)
- Other man-made radioactive sources
Identifying these sources is critical for radiation safety and emergency response.
