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Lab # 6

Lab # 6. Occupational Exposure Protection of the Worker. Protection of the worker. 2. The use of radiations and radiolabeled products for any purpose is governed by regulatory agencies in different countries all over the world.

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Lab # 6

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  1. Lab # 6 • Occupational ExposureProtection of the Worker

  2. Protection of the worker 2

  3. The use of radiations and radiolabeled products for any purpose is governed by regulatory agencies in different countries all over the world. • The use of radiopharmaceuticals in humans was almost unregulated until the late 1950s. • Until 1963, all reactor-derived radiopharmaceuticals were under the control of the Atomic Energy Commission • (AEC, now the Nuclear Regulatory Commission, (NRC)) only for their radiation hazards. • The therapeutic or diagnostic efficacy and the pharmaceutical quality of radiopharmaceuticals were not regulated by the AEC or by the U.S. Food and Drug Administration (FDA) until the early 1960s. • In 1963 the FDA introduced rules stating that the clinical efficacy of all radiopharmaceuticals.

  4. Radiation Protection • Because radiation can cause damage in living systems, international and national organizations have been established to set guidelines for the safe handling of radioactive materials. • The International Committee on Radio logical Protection (ICRP) • The National Council on Radiation Protection and Measurement (NCRP) • They set guidelines for all radiation workers to follow in handling radiations

  5. Occupational Exposure Protection of the Worker

  6. RESPONSIBILITIES • Licensees shall ensure for all workers that: • Occupational exposure be limited and optimized • Suitable and adequate facilities, equipment and services for protection be provided • Appropriate protective devices and monitoring equipment • be provided and properly used • Appropriate training be provided as well as periodic • retraining and updating 6

  7. RESPONSIBILITIES • “Workers shall: • Follow any applicable rules for protection • Use properly the monitoring devices and the protective equipment and clothing provided 7

  8. Caution Signs and Labels • The NRC requires that specific signs, symbols, and labels be used to warn people of possible danger from the presence of radiations • These signs use purple, and black colors on a yellow background • Some typical signs are shown in the figures 9

  9. Caution: Radiation Area: This sign must be posted in radiation areas. • Caution: High Radiation Area or Danger: High Radiation Area: This sign must be posted in high radiation areas. • Caution: Radioactive Material or Danger: Radioactive Material:This sign is posted in areas or rooms in which 10 times the quantity or more of any licensed material specified in Appendix C of 10CFR20 are used or stored. • All containers with quantities of licensed materials exceeding those specified in Appendix C of 10CFR20 should be labeled with this sign.

  10. Occupational Exposure Protection of the Worker • Sources of exposure

  11. EXPOSURES IN NUCLEAR MEDICINE Internal Ingested and/or inhaled radionuclides External Vials, syringes, patients. 12

  12. Exposure of the workerExternal Exposure • Unpacking radioactive material • Activity measurements • Storage of sources • Internal transports of sources • Preparation of radiopharmaceuticals • Administration • Examination of the patient • Care of the radioactive patient • Handling of radioactive waste • Accidents 13

  13. Contamination of the worker • spills • improper administration • experimental work with animals • emergency surgery of a therapy patient 14

  14. Dose to worker 2,5 2 1,5 Dose (uSv) 1 0,5 0 Dispensing Injection Examination Measurements of this kind can show different results in different hospitals 15

  15. Occupational Exposure Protection of the Worker • Personal protective equipment. Safe handling of sources.

  16. Principles of Radiation Protection • Of the various types of radiation the alpha particle is most damaging due to its great charge and mass followed by the b particle and the g rays

  17. Radiation Protection Measures • Depend on: • Time • Distance • Shielding • Type of radionuclide and its chemical properties 18

  18. Time Dose is proportional to the time exposed it is wise to spend no more time than necessary near radiation sources 20

  19. Consequence • Reduce time in contact with radiation sources as much as compatible with the task • Training of a particular task using non-radioactive dummy sources helps 21

  20. Distance • It is recommended that an individual remains as far away as possible from the radiation source. • Procedures and radiation areas should be designed such that only minimum exposure takes place to individuals doing the procedures or staying in or near the radiation areas. 22

  21. Patient with iodine-131 0.5 0.1 0.06 0.03 1000 MBq I-131 0 0.5 1 2 m 23

  22. Consequence • Distance is very efficient for radiation protection as the dose falls off in square • Examples: • long tweezers for handling of sources • big rooms for imaging equipment 24

  23. Shielding • Various high atomic number (Z) materials that absorb radiations can be used to provide radiation protection • The ranges of alpha and b particles are short in matter the containers themselves act as shields for these radiations • Alpha can be stopped by a piece of paper • Beta low molecular weight element Al or glass can stop its effect. (Whay don’t we use lead for shielding of beta radiation?) • Gama radiations are highly penetrating absorbing material must be used for shielding of g-emitting sources • Lead is most commonly used for this purpose. 25

  24. Shielding Barrier thickness incident radiation transmitted radiation 26

  25. Shielding Bench top shield Vial shields Syringe shields 27

  26. SHIELDING OF SOURCES • Factors affecting the design: • radionuclide • activity • shielding material 28

  27. Devices to measure personnel radiation exposure. • The film badge is most popular and cost-effective for personnel monitoring and gives reasonably accurate readings of exposures from b, g, and x radiations. • A: Pocket dosimeter. B: Film badge holder. • C: Film badge. D: Thermoluminescent chip in finger badge

  28. Dos and Don’ts in Radiation Protection Practice • Do post radiation signs in radiation areas. • Do wear laboratory coats and gloves when working with radioactive • materials. • Do work in a ventilated fumehood when working with radioactive gases. • Do cover the trays and workbench with absorbent paper. • Do store and transport radioactive material in lead containers. • Do wear a film badge while working in the radiation laboratory. • Do identify all radionuclides and dates of assay on the containers.

  29. Dos and Don’ts in Radiation Protection Practice • Do survey work areas for any contamination as frequently as possible. • Do clean up spills promptly, and survey the area after cleaning. • Do not eat, drink, or smoke in the radiation laboratory. • Do not pipette any radioactive material by mouth. • Do monitor hands and feet after the day’s work. • Do notify the RSO in case of any major spill or other emergencies related to radiation.

  30. Well, ask a question and feel stupid for 5 minutes or don't ask and be stupid forever.

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