15 Questions
What is the purpose of calibration for survey meters?
To ensure the accuracy of the measurements
Which characteristic is related to the built-in GM detector of the survey meter?
Energy Response
What is the temperature range for the survey meter mentioned in the text?
-20°C to 50°C
Which characteristic is not specified in the radiological characteristics of the survey meter?
Battery Lifetime
What does the built-in speaker of the survey meter allow the user to do?
Check the battery condition
What is the correction factor for the dose rate range 0 – 5 R/h?
1.22
What is the calibration factor for a tube potential of 100 kV?
1.64
When is recalibration of the survey meter required?
If the survey meter gives suspicious readings
Which X-ray source has a calibration factor of 1.72?
137Cs(662)
What is the calibration factor for a tube potential of 150 kV?
1.56
What is the importance of repeatability in survey meters for radiation protection?
To have a small standard deviation with acceptable error
Why is it important for survey meters to have exactness and linearity?
To give readings equal to the true value
What does the instrument response time of survey meters refer to?
Time required for stabilization of reading
Why is energy-response dependency significant for survey meters?
Response or calibration factor varies with radiation energy
What is the purpose of calibration for survey meters?
To ensure reliable functioning and accurate readings
Study Notes
- Radiological characteristics of survey meters:
- Measuring quantity for external radiation: X, gamma or beta, ensuring detection of radiation with specialized equipment.
- Repeatability: small standard deviation is desirable for radiation protection, with acceptable error.
- Exactness and linearity: capable of giving readings equal to the true value and verified at specific points.
- Measuring range: three types based on specific requirements, covering different dose rates.
- Instrument response time: stabilization of reading, with longer response time for low dose rates and high dose rates.
- Energy-response dependency: response or calibration factor varies with radiation energy; unacceptable variation exceeds 30% unless fully calibrated.
- Isotropy & geotropism: response at all angles within certain limits and response at different orientations within 10%.
- Conditions of use for survey meters:
- Suitable design for various operating conditions, including ease of use and durability.
- Choice of rate meters or integrators for specific types of radiation sources.
- Calibration of survey meters:
- Importance of calibration to ensure reliable functioning and accurate readings.
- Requirement of calibration for legal compliance and traceability.
- Calibration process and certificate issuance.
- Types of survey meters and their uses:
- Sealed gamma ray and X-ray sources: use rate meters and integrators.
- Unsealed sources: use gases, liquids, environmental samples, or surface contamination counters.
Test your knowledge on the characteristics, selection, and calibration of survey meters for radiation detection. Topics include radiological characteristics, conditions of use, choice of meters for different types of sources, calibration requirements, and certification.
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