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Radiological Monitoring With The CD V-777-1 Kit

Radiological Monitoring With The CD V-777-1 Kit. What is the CD V-777-1 Kit ?. The CD V-777-1 isn’t actually a specific meter. It’s the name given to the entire kit as seen to the right. The kit contains the following items: The CD V-700 Meter The CD V-715 Meter The CD V-742 Dosimeter

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Radiological Monitoring With The CD V-777-1 Kit

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  1. Radiological Monitoring With The CD V-777-1 Kit

  2. What is the CD V-777-1 Kit ? • The CD V-777-1 isn’t actually a specific meter. It’s the name given to the entire kit as seen to the right. The kit contains the following items: • The CD V-700 Meter • The CD V-715 Meter • The CD V-742 Dosimeter • The CD V-750 Dosimeter charger • Batteries • Straps • Headset • Possibly instructions

  3. What is the CD V-777-1 Kit ? The CD V-777-1 was originally produced in the 1950’s and 60’s in conjunction with the Office Of Civil Defense. Natural nuclear fears arose during the early 50’s due to the Korean War and tensions between the United States and The Soviet Union.

  4. Basic Radiation 4-1-1 Its time for a radiation refresher as we get you ready to use the CDV kit to its fullest extent. The primer starts with an explanation of what radiation exactly is. So, what is radiation ? The term itself is used most commonly to refer to nuclear materials, but radiation is any process that transmits energy through space or a material away from a source in the form of particles or waves. All of this radiation falls along what’s called the electromagnetic spectrum. The spectrum is broken down into ionizing and non ionizing radiation.

  5. Basic Radiation 4-1-1 NON IONIZING RADIATION Non-ionizing radiation is the type of radiation we are most used to and the one we are most exposed to. The chart on the previous slide gave examples of ionizing and non-ionizing radiation. Even though ionizing radiation is more dangerous, non-ionizing radiation can be dangerous as well. For example, one very common, long held concern deals with power line safety, which emits radiation in the form of an electromagnetic field (EMF). There has been no SUBSTANTIAL proof that claims this EMF is indeed dangerous. Other types of non-ionizing radiation, including microwaves, cell phone radiation, continue to be sources of concern for the general public. Ultraviolet radiation (UV) from the sun, however, is known to cause skin cancer.

  6. Basic Radiation 4-1-1 IONIZING RADIATION We will focus our attention on ionizing radiation, since that is the most dangerous form of radiation and the type of radiation the meters in the CD V-777-1 kit are designed to detect. What is ionizing radiation ? Its radiation strong enough to knock off electrons from other atoms. One source of this type of radiation comes from unstable nuclei, like plutonium and uranium, which occur naturally in the environment.

  7. Basic Radiation 4-1-1 The following are sources of ionizing radiation A photoionization detector (PID) uses ionization to determine concentrations of volatile organic compounds Some examples of common forms of ionizing radiation. Uranium and Plutonium are common elements at nuclear facilities Smoke detectors contain Americium 241, an alpha emitter

  8. Basic Radiation 4-1-1 What types of ionizing radiation are there ? Alpha Beta Gamma X-ray Symbol for ionizing radiation

  9. Basic Radiation 4-1-1 Alpha Particles Examples Of Alpha Emitters Americium 241 - Used in smoke detectors to ionize air molecules Plutonium-239 - used in nuclear weapons. The bomb dropped on Nagasaki used Pl-239 Uranium-238 - Most common use for nuclear reactors. Depleted Ur used by military in shielding for tanks. Thorium-232 - most widely used in lantern mantles for the brightness it imparts Radon-222 - found at low concentrations in almost all rock and soil. Can creep up through soil and build in amount inside buildings Polonium-210 - • Composed of two neutrons and two protons, identical to a helium atom, but no electrons in the outer shell • Have a large mass, and because of this do not travel far, maybe a few inches • Travel can be stopped by a piece of paper and your intact skin • Actually, one of the most dangerous forms of radiation, IF it gets into your body via ingestion, inhalation, etc. • Will ionize (knock off an electron) from air particles as it passes them

  10. Basic Radiation 4-1-1 Beta Particles Examples of beta emitters: Tritium - a hydrogen isotope, used to illuminate exit signs and watches cobalt-60 - used to sterilize medical equipment, also a source for radiography and food irradiation strontium-90 - radioactive source for depth gauges, tx of bone cancer technetium-99 - radioactive waste from medical procedures and nuclear accidents iodine-129 and -131 - Used extensively in nuclear medicine, especially helpful in thyroid treatment cesium-137 - Used heavily in industry as a depth gauge, and to detect liquid flow in underground pipes • Essentially a discharged electron, about 2000 times smaller than an alpha particle • Have a small range, usually a couple of feet • Will ionize other atoms, but not as much an an alpha particle • Does have more penetrating power, but can be stopped by a sheet of aluminum foil. • High energy beta particle can penetrate skin

  11. Basic Radiation 4-1-1 Gamma Rays Examples of gamma emitters: Cobalt-60 sterilize medical equipment in hospitals pasteurize certain foods and spices treat cancer gauge the thickness of metal in steel mills. Cesium-137: cancer treatment measure and control the flow of liquids in numerous industrial processes investigate subterranean strata in oil wells measure soil density at construction sites ensure the proper fill level for packages of food, drugs and other products. • Very high energy • Have no mass and no electrical charge--they are pure electromagnetic energy. • Travel at the speed of light and can cover hundreds to thousands of meters in air before spending their energy • Can pass through many kinds of materials, including human tissue. • Very dense materials, such as lead, are commonly used as shielding to slow or stop gamma photons.

  12. Measuring Radiation The radiation energy absorbed is called the dose and when considering doses to human tissue, it is measured in units of “rems.” Frequently when considering doses, the unit used is the millirem which is one one-thousandth (1/1000) of a rem

  13. Measuring Radiation RAD, REM, ROENTGEN, what gives ? All these terms used to measure radiation can get very confusing. When do you use either of these 3 terms ? They are all essentially considered the same. One RAD is equal to one REM and one Roentgen. The actual definitions: Roentgen - The roentgen measures the energy produced by gamma radiation in a cubic centimeter of air. Its basically a measure of the amount of radiation something gives off. RAD - Stands for ‘radiation absorbed dose’, and specifically reflects the amount of radiation an object, specifically a human, has actually absorbed. REM - Stands for ‘Roentgen Equivalent Man’, and is designed to reflect the differences in absorbed doses based on the type of radiation you are exposed to. So in order to get the does in REM, you need to multiply the dose in RAD X a coefficient that relates to what type of radiation. For X Rays and Gamma rays, multiply by 1, neutrons multiply by 5, and alpha particles multiply by 20. You can see by those numbers that alpha particles, once absorbed, damage the body the most.

  14. Measuring Radiation Radiation Doses Acute Radiation Dose Effects in Millirem 450,000.0 (450 REM) Acute dose, LD 50/60 (a lethal dose to 50% of a population within 60 days if no medical treatment) 100,000.0 (100 REM) Acute dose, radiation sickness, reduced blood count, recovery 25,000.0 (25 REM) Acute dose, reduced fertility, and temporary sterility 10,000.0 (10 REM) Minimum acute dose for which prompt effects are detectable

  15. Measuring Radiation Radiation Doses in Millirem from Various Exposures (Annual Dose Unless Otherwise Stated) 10,000.0 Dose to Chernobyl evacuees 5,000.0 U.S. Occupational Dose limit 2,000.0 Tobacco smoking 1,500.0 Underground uranium mines 400 – 800.0 St. Peters Square, Rome 600.0* Pelvic x-ray exam 500.0* Barium enema x-ray exam 500.0 U.S. Occupational Dose limit for pregnant women per 9 months 480.0 Denver, Colorado 360.0 Average U.S. dose 100.0 Dental x-ray dose to center of cheek 20.0 1 Chernobyl per year 15.0* Chest x-ray 7.0 Nuclear testing (peak year) 4.0 Fallout 2.0 Airplane trip coast to coast 1.0 Nuclear power 0.5 TV at surface 0.1 Sleeping with another human

  16. Measuring Radiation The highest lethal doses seen by victims of Hiroshima and Nagasaki was in the range of 700 REM

  17. Measuring Radiation • Radiation Limits For Fire Service Operations • The outside of the hot zone should be established at 2 mr/hr. • Exposure Limits • How much radiation can I be exposed to ? • For the radiological industry workers: • 5 R or 5000 mR per year But What About US ?

  18. Measuring Radiation Typical American Family Radiation Limits For Fire Service Operations We Risk A Lot To Save A Lot We Risk A Little To Save A Little… Our exposure limit is dependent on what is at stake

  19. Measuring Radiation Typical American Family Radiation Limits For Fire Service Operations The average American’s risk for getting cancer is…. 24 %

  20. Measuring Radiation Typical American Family Radiation Limits For Fire Service Operations 5 Rem = Any Response 10 Rem = Valuable Property 25 Rem = Lifesaving Greater than 25 Rem = Lifesaving (Voluntary Basis Only)

  21. Measuring Radiation Typical American Family Radiation Limits For Fire Service Operations 5 Rem = Any Response 10 Rem = Valuable Property 25 Rem = Lifesaving Greater than 25 Rem = Lifesaving (Voluntary Basis Only) 25 Rem = a 2% increase in cancer risk, from 24% to 26%

  22. Measuring Radiation Typical American Family Radiation Limits For Fire Service Operations 5 Rem = Any Response 10 Rem = Valuable Property 25 Rem = Lifesaving Greater than 25 Rem = Lifesaving (Voluntary Basis Only) 50 Rem = a 4% increase in cancer risk, from 24% to 28%

  23. Measuring Radiation Typical American Family Radiation Limits For Fire Service Operations 5 Rem = Any Response 10 Rem = Valuable Property 25 Rem = Lifesaving Greater than 25 Rem = Lifesaving (Voluntary Basis Only) 100 Rem = a 5 % mortality rate

  24. Using the CD V-777-1 Kit CD V-715 • Used to detect gamma radiation only • Can be used for 150 straight hours • Can be used in any humidity level • Very powerful battery, be careful • Designed for ground survey • Measures 0-500 r/hr

  25. Using the CD V-777-1 Kit CD V-715 • How To Use The CD V-715 • Install one “D” cell battery • Turn the selector switch to ‘zero’ and let the unit warm up for two minutes • After two minutes, use the ‘zero’ knob to zero out the instrument

  26. Using the CD V-777-1 Kit CD V-715 How To Use The CD V-715 • Turn selector switch to ‘circuit check’ and confirm the needle goes into the red ‘circuit check’ area on the gauge • Check all marks (X100, X10, X1, and x.01) and confirm no major movement of needle. A major movement would be past the ‘2’ mark on the gauge.

  27. Using the CD V-777-1 Kit CD V-700 • Used to detect gamma and beta radiation • Designed for low level measurements • Very powerful batteries, be careful • Used for personnel monitoring • Check for degree of contamination of food and water • Measures from 0-50 mR/hr

  28. Using the CD V-777-1 Kit CD V-700 • How To Use The CD V-700 • Install 5 “D” cell batteries • Turn selector switch to the “X10” mark and allow 30 seconds for warm up • Rotate probe shield to fully open position

  29. Using the CD V-777-1 Kit CD V-700 • How To Use The CD V-700 • Place probe as close as possible to operational check source on side of meter. • The meter should read between the range written on the sticker on the back of the meter during its last calibration. If it doesn’t, do not use.

  30. Using the CD V-777-1 Kit CD V-700 • How To Use The CD V-700 • Radiation doses exceeding 50 mR/hr to 1 R/hr will produce off scale readings and will saturate the meter. This could result in a reading of zero or less than full scale. Use a higher range instrument (CD V-715)

  31. Using the CD V-777-1 Kit CD V-742 How much radiation have I been exposed to, if any ? • Measures accumulated gamma doses from 0-200 R. • Difficult to read, difficult to zero out or “charge” • Will require charging using the CD V-50.

  32. Using the CD V-777-1 Kit CD V-742 2 1 Place the side with the exposed needle like object onto the port of the CD V-750 Installing the battery in the CD V-750 dosimeter charger 3 Look through the dosimeter and use the ‘up scale’ and ‘down scale’ knob to zero out the dosimeter

  33. Using the CD V-777-1 Kit CD V-742 ...until this vertical black line is on the zero Rotate this slowly… ROENTGENS 0 20 40 60 80 100 120 140 160 180 200

  34. That’s All Folks !

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