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Disposal Procedures

Management of Radioactive Waste. Disposal Procedures. Waste Handling. Decay Dilution Landfill. Decay Considerations Half-life Energy/ Shielding Storage/decay space. #1 – Hold for Decay. Gaseous Waste. Fumes Gases Dusts Vapors. Release Limit is Set for each isotope by CNSC

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Disposal Procedures

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  1. Management of Radioactive Waste Disposal Procedures

  2. Waste Handling • Decay • Dilution • Landfill

  3. Decay Considerations • Half-life • Energy/ Shielding • Storage/decay space

  4. #1 – Hold for Decay

  5. Gaseous Waste Fumes Gases Dusts Vapors Release Limit is Set for each isotope by CNSC See Table 5 in the Manual for details

  6. Liquid Waste • Aqueous • Organic – includes ALL scintillation cocktails • Aqueous Organic Biodegradable

  7. Waste Disposal – Liquid Maximum allowable activity

  8. Liquid Waste • Decay P-32, S-35 etc • Drains • Red Plastic Solvent Containers • Fume Hood (small amounts)

  9. Red Solvent Waste Container C-14 Release Limit =37 kBq/l Container volume = 5 litres R.L. x Volume=Activity limit per container 37 kBq/l x 5 litres= 185 kBq • How much C-14 is allowed in one container?

  10. 185kBq/5 liters = (185,000 dps/5 l) x (60s/1min) = 11,100,000 dpminute/5 l @ 100% effic = 11,100,000 cpm allowed in 5 liters (5000ml) Count 1 ml = 2220 counts is allowed.

  11. - Separate scintillation cocktails used with different isotopes. e.g. H-3, P-32 - Count a sample of your scintillation waste periodically. - Separate ‘hot’ cocktail samples if limits for disposal are approached.

  12. Dilution – Not Recommended • How to dispose 46 MBq of C-14 in non-toxic wash water? C-14 Release Limit = 37 kBq/l Activity = 46 MBq Water flow = 10 litres/min Activity / RL = # of litres required 46MBq / 0.037 MBq/l =1243 litres Litres / Water flow = Dilution time required 1243 litres / 10 litres/min = 124.3 min

  13. Diluted waste Water IN Water OUT Hot solution Contact HSE before considering using this method to dispose of waste…

  14. Solid Waste – Low Activity • Decay • Landfill Follow release limit AND 2.5 Sv/h at the surface

  15. WASTE Disposal - Solid And less than 2.5 Sv/hr at the surface

  16. Timed Disposal Nf No -0.693 ln x T1/2 = T T1/2 =14.3 days No= Nf= Thus T= Decay time for 9.25 MBq of P-32 in 1.0 kg? www.ubc.ca/okanagan/hse/safety/radiosotope.html

  17. SOLID WASTE – Low Activity • As waste is generated, deface all radiation warning labels and place into lined radioactive waste container - Lid and Label • When full - complete and attach Low Activity • Waste (LAW) label and place bag in decay • storage area • - note disposal date on calendar (TABLE 5 in Manual)

  18. Caution RadioactiveMaterial Low Activity Waste for Decay Permit Holder(PI)/Lab ________________ Waste Generator Name _______________ Lab Contact Phone # _______________ RADIOISOTOPE : ________ Activity to decay ______MBq (FROM YOUR RADIOISOTOPE DATASHEET) Survey meter reading at surface of box ____ uSv/hr Box #___ Initial Date _____________ Disposal Date _____________ Actual Date of Disposal ____________ Disposed by _____________________ REMOVE THIS SHEET ON DISPOSAL DATE AND SAVE WITH YOUR RECORDS. COMPLETE YOUR ANNUAL INVENTORY WITH DISPOSAL INFORMATION

  19. Solid materials: vials; pipet tips; centrifuge tubes; • gloves; paper • BUT… • Please minimize your solid waste being held for • decay or material requiring shipment for disposal. • Website: Useful tips : Maximum activity levels for • immediate disposal

  20. *When Disposal date arrives check that waste is less than the defined Release limit and less than 2.5  Sv/hr (0.25 mR/hr) at the surface. *Enter disposal info on inventory sheet • **Contact HSE for disposal of Radioactive Wastes** • www.ubc.ca/okanagan/hse/environment/hazardousmaterials

  21. Radioactive Biohazardous Materials Disposal • Treat with phenol based biocide • Double bag – calculate storage time and attach Low Activity Waste (LAW) sheet • Store in freezer and test • Tag as biohazard with red tags • Notify HSE • Remove LAW sheet

  22. High Activity Waste • Long-lived high activity • New paint can • Cloverdale paint • Home Hardware • Stock solution vials • Pipette tips • Contaminated solids

  23. 15. Radiation Emergency Response IMMEDIATELY notify HSE in the event of any accidental radioisotope release, spill of material or personal contamination. Contact security for immediate HSE response 807-8111 or 78111 Lab Practical Session: *management of small scale spills.

  24. 18. Security of Radioactive Material Doors shall be closed and locked when lab is unoccupied. Only authorized/trained personnel are permitted access to radioactive material/sources: secondary locked containers as needed

  25. Missing/damaged/incorrect shipments must be IMMEDIATELY reported to HSE. • Missing/stolen/misplaced material must be IMMEDIATELY reported to HSE. • Challenge strangers. • Keys???

  26. Isotopes and Personal Responsibility • Professionalism • Choices • Integrity

  27. Responsibilities of Licence Holders • Ensure conditions stated in the licence are fulfilled and safe laboratory practicesare followed as per posted signs • Ensure staff and students using radioactive materials have been authorized to use these radioactive materials.

  28. Responsibilities of Licence Holders • Ensure staff have received adequate radiation protection training* and have been informed of the risks associated with exposure to ionizing radiation. *provision of specific training in radioisotope handling in their laboratories.* • 5 yr training competency requirement.

  29. Responsibilities of Licence Holders • Ensure that if required, staff have been issued, and wear, a thermoluminescent dosimeter and participate in bioassay programs. • Designate specific work and storage areas for radioactive materials • clean, properly labelled, adequate ventilation, adequately shielded.

  30. Responsibilities of Licence Holders • Maintaininginventoriesof all purchases, storage, disposal. • Maintaining all area monitoring and/or wipe test records. • Reporting all radiation incidents to HSE.

  31. Responsibilities of Radioisotope Users • Every person…shall… • take all reasonable and necessary precautions to ensure their own safety and the safety of fellow workers. • strictly adhere to all policies and procedures defined by the CNSC regulations, WCB Regulations and the University Safety Policy as described in this Manual.

  32. Maryland hits Johns Hopkins • with $370,000 fine • For violations of state law relating to use of ionizing radiation and handling of radioactive materials. • Failure to secure radioactive materials from • unauthorised access • Beverages taken into laboratories • Failure to keep radiation measurement equipment in • calibration • Failure to label radioactive waste • Failure to conduct surveys for removable contamination Sound Familiar?

  33. Goiania, Brazil

  34. Goiania Clinic

  35. There is a theory which states that if ever anyone discovers exactly what the Universe is for and why it is here, it will instantly disappear and be replaced by something even more bizarre and inexplicable. There is another theory which states That this has already happened. D.Adams -

  36. Review Questions? • What is the underlying principle behind handling Low Activity Wastes? • How should radioactive biological materials be rendered biologically inactive? • If the specific activity waste limits are met, what else must be met prior to disposal?

  37. Next day • Lab portion 1: Sci 357 1-2 pm • Appropriate lab attire • Lab coat & safety glasses • Final Exam: 2-4 pm Sci 3337 • 17 M/C • 27 T/F • 20 fill in blanks / short answer • Bring: • Scientific Calculator

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