Test Radiation Or Contaminant Measurement Instruments Training

Objectives:
• Define ionising radiation and common contaminants in industrial environments.
• Identify types of radiation (alpha, beta, gamma, neutron) and their properties.
• Understand the basic principles of radiation detection and measurement.
• Recognise relevant South African regulations and standards (e.g., NNR, SAQA).

Topics:
• Overview of radiation types and sources
• Contaminants: radioactive, chemical, biological
• Units of measurement (Sievert, Becquerel, Gray)
• Biological effects of radiation exposure
• Legal framework: National Nuclear Regulator Act, Occupational Health and Safety Act
• Introduction to measurement instruments: survey meters, dosimeters, contamination monitors

Objectives:
• Explain the operating principles of gas-filled detectors, scintillation detectors, and semiconductor detectors.
• Compare different detector types in terms of sensitivity, energy resolution, and application.
• Describe the function of photomultiplier tubes and readout electronics.
• Understand the concept of dead time and its effect on measurement accuracy.

Topics:
• Gas-filled detectors: ionisation chambers, proportional counters, Geiger-Müller tubes
• Scintillation detectors: organic and inorganic scintillators
• Semiconductor detectors: silicon, germanium
• Detector efficiency and energy resolution
• Signal processing: preamplifiers, amplifiers, discriminators
• Practical demonstration: detector response to different radiation sources

Objectives:
• Describe the importance of calibration in ensuring measurement accuracy.
• Perform calibration checks using standard sources (e.g., Cs-137, Co-60).
• Apply statistical concepts (mean, standard deviation, confidence intervals) to measurement data.
• Implement quality assurance procedures including background checks and response tests.

Topics:
• Calibration standards and traceability
• Calibration setup for different instrument types
• Statistical analysis of counting data
• Background radiation measurement and subtraction
• Daily functional checks: battery, response, alarm tests
• Record keeping and documentation requirements

Objectives:
• Operate various survey meters (e.g., Ludlum, Thermo Scientific) correctly.
• Interpret readings in different units (cpm, µSv/h, mR/h).
• Identify common sources of error and interference.
• Conduct area surveys and map radiation levels.

Topics:
• Survey meter controls and display functions
• Range selection and scale reading
• Time constant and response time effects
• Survey techniques: grid, spiral, and hotspot searches
• Identifying and mitigating electromagnetic interference
• Practical exercise: performing a simulated area survey

Objectives:
• Distinguish between fixed and removable contamination.
• Operate contamination monitors (e.g., pancake GM, alpha scintillation probes).
• Perform smear (wipe) tests and analyse results.
• Apply contamination control measures and decontamination procedures.

Topics:
• Types of contamination: loose, fixed, and airborne
• Direct monitoring techniques: probe selection and scanning speed
• Indirect monitoring: smear test protocol and counting
• Interpreting contamination limits (e.g., clearance levels)
• Decontamination methods and effectiveness checks
• Practical exercise: contamination monitoring of a simulated area

Objectives:
• Explain the principles of personal dosimetry and dose limits.
• Use passive dosimeters (TLD, OSL) and active dosimeters (electronic personal dosimeters).
• Calculate accumulated dose and compare with regulatory limits.
• Implement ALARA (As Low As Reasonably Achievable) principles.

Topics:
• Dose quantities: equivalent dose, effective dose
• Regulatory dose limits for workers and public
• Passive dosimeter types: TLD, OSL, film badge
• Active dosimeters: features, alarms, data logging
• Dose records and reporting requirements
• ALARA in practice: time, distance, shielding

Objectives:
• Operate a gamma spectrometer and identify radionuclides using energy spectra.
• Perform energy calibration and efficiency calibration.
• Analyse spectral data using software (e.g., Genie 2000).
• Understand the principles of alpha and beta spectroscopy.

Topics:
• Gamma ray interactions: photoelectric effect, Compton scattering, pair production
• Multichannel analysers and pulse height analysis
• Energy calibration using known sources
• Nuclide identification and peak fitting
• Alpha spectroscopy: sample preparation and resolution
• Practical: identification of unknown source using gamma spectrum

Objectives:
• Integrate multiple instruments and techniques in realistic scenarios.
• Conduct a comprehensive radiation survey including contamination and dose assessment.
• Respond to simulated alarm events and implement emergency procedures.
• Document findings and prepare a survey report.

Topics:
• Scenario 1: Routine area survey in a controlled area
• Scenario 2: Contamination incident response
• Scenario 3: Source retrieval and shielding assessment
• Use of combined instruments: survey meter, contamination monitor, dosimeter
• Emergency procedures: evacuation, notification, decontamination
• Report writing: data presentation, conclusions, recommendations

Objectives:
• Demonstrate competence through practical and theoretical assessments.
• Review key concepts and address knowledge gaps.
• Understand the process for unit standard 119494 certification.
• Develop a personal action plan for continued professional development.

Topics:
• Written assessment covering theory and regulations
• Practical assessment: instrument operation, calibration, survey, contamination monitoring
• Results review and feedback session
• Certification criteria and SAQA credits
• Resources for ongoing learning: manuals, online courses, professional bodies
• Course evaluation and closing