Topic 14 - Radiological Monitoring_Data Interpretation Record Keeping-RPO Jan 2020.ppt

RADIOLOGICAL MONITORING: DATA INTERPRETATION & RECORD KEEPING Contents Contents • • • • • Introduction Radiological Monitoring Data Interpretation Record Keeping Summary Introduction Introduction Objectives radiological monitoring :  To assess the radiation exposure situation to ensure complia...

RADIOLOGICAL MONITORING: DATA INTERPRETATION & RECORD KEEPING Contents Contents • • • • • Introduction Radiological Monitoring Data Interpretation Record Keeping Summary Introduction Introduction Objectives radiological monitoring :  To assess the radiation exposure situation to ensure compliance with BSS requirements.  To verify the effectiveness of radiation protective measures provided at work places.  To identify occurrence of any abnormal radiation exposure situation in work places.  To keep a constant surveillance over the working environment. Radiological Radiological Monitoring Monitoring  Personnel and workplace monitoring are carried out:   To control occupational exposure of working personnel. Work place monitoring is more toward controlling public exposure. Radiological Radiological Monitoring Monitoring  BSRP require individual monitoring for any worker normally employed in a controlled area.  However, doses may be assessed from the results of workplace monitoring in some circumstances.  This requires information on the locations and durations of exposure of the worker. Derive worker exposure from workplace monitoring when:  Workers are regularly employed in a supervised area or require only occasional access to controlled areas.  Effective individual monitoring is unavailable and a method based on workplace monitoring has been shown to be acceptable.  Doses are relatively invariant and can be reliably assessed by other means. For example, air crew exposure - from knowledge of dose rates and flight record details, without the need for individual or continuous workplace monitoring. Derive worker exposure from workplace monitoring when: Doses are relatively invariant and can be reliably assessed by other means, for example;  air crew exposure,  from knowledge of dose rates and flight record details,  without the need for individual or continuous workplace monitoring. Workplace monitoring programmes should specify:  Quantities to be measured;  When and where the measurements;  How frequently the measurements should be made;  Appropriate measurement methods and procedures; and  Reference levels and actions to be taken if they are exceeded. Workplace monitoring has a role in:  Prior work planning (optimization);  Estimating exposure retrospectively if individual dosimeters are lost or damaged;  Clearly defining controlled or supervised radiation areas;  Detecting changes in radiation levels;  Confirming that radiation field measurements agree with design and expected radiation conditions;  Assisting in designing and establishing protective measures. Additional workplace monitoring roles  Providing data for ongoing review of the optimization of protection;  Commissioning tests, following plant construction and modification;  Confirming that design safeguards, such as shielding, are effective; and  Detecting abnormal conditions to allow an appropriate corrective response in a timely manner. Data Data Interpretation Interpretation Data Interpretation • Exposure and contamination data obtained are analysed and interpreted with reference to authorized and acceptable standards. • For individual monitoring, the limits most commonly used in the control of external radiation are Equivalent Dose and Effective Dose. • Derived Dose Limits (e.g. ALI and DAC) are used in estimating risk from intake or radioactive materials. • For area monitoring, radiological risk are usually calculated and reported in terms of the activity concentrations of radionuclides, and external radiation. Data Data Interpretation Interpretation Type of Monitoring: Personnel Mode of Exposure Quantity Measurement Unit External • Effective Dose • Equivalent Dose • Occupational Exposure • Public Exposure • Medical Exposure • • • • • • mSv/month mSv/month mSv mrem mGy mR Internal • Activity • Activity Concentration • • • • cps cpm Bq Ci Contamination • Activity • Activity Concentration • • • • cps cpm Bq Ci authorized and acceptable standards • Worker: 20 mSv/yr (W Body) • Worker: 150 mSv/yr (lens) • Worker: 500 mSv/yr (skin) • Student: 6 mSv/yr • Public: 1 mSv/yr • Supporting personnel: 5 mSv/yr • Visitor (<16 yrs old): 1 mSv/yr • ALI - Bq • DAC – Bq/m3 (Depends on types of radioisotope and its chemical compound and mode of entry into the body) • Leak: >185 Bq • Surface: Bq/cm2 • Airborne:Bq/cm3 Data Data Interpretation Interpretation Type of Monitoring: Workplace Mode of Exposure Quantity Measurement Unit External Radiation • Dose • Doserate • Dosimeter • mR/hr, • mRad/hr or Gy/hr • mRem/hr or Sv/hr • mSv/month Contamination Activity Concentration • cpm • cps Airborne Contamination Activity Concentration • cpm • cps Authorized/acceptable standards Controlled: >6 mSv/yr or 3 Sv/hr Supervised: 1-6 mSv/yr or 0.5-3 Sv/hr Uncontrolled: < 1 mSv/yr or 0.5 Sv/hr Worker: < 10 Sv/hr or 20 mSv/yr Public: < 0.5 Sv/hr or 1 mSv/yr • Source leak: > 185 Bq • Supervised area: 2 – 7 Bq/cm2 • Controlled area:  7 Bq cm-2 • Supervised area: 3x10-3 to 1x10-2 Bqm-3 • Controlled area:  1x10-2 Bq m-3 Record Record Keeping Keeping • The records kept with respect to all radiation activities represent the main proof that an authorized user has of his compliance with the radiation protection regulations. • These are important for legal purposes as well as for effective administration of the radiation-protection program. Record Record Keeping Keeping The registrant or licensee should maintain:  Authorization/registration documents - retention period until expiry date.  Medical records for each worker, LPTA/BM/5 (A) – 30 yrs  Personnel radiation exposure records, LPTA/BM/5 (B) – 30 yrs  Results from workplace monitoring – 2 yrs  Radiation surveys or wipe tests – 2 yrs  Instrument calibration – 2 yrs Record Record Keeping Keeping Other records to be maintained: • Training provided, initial and refresher (2 yrs?)- :  Name of trainers  Name of trainees  Date and length of the training  List of the topics addressed  Copy of the certificates of training • Waste disposal – 2 yrs • Radiation incidents – 2 yrs • Audits and reviews – 2 yrs Summary Thank You for your attention