ࡱ> @B? fbjbj 4$c`c`f ;;;;;OOOOcO0(wwwwwRRRh0j0j0j0j0j0j0$350;RRRRR0;;ww0R";w;wh0Rh0./ L4t.h/T0000|/g6@g6(//g6;0DRRRRRRR00"RRR0RRRRg6RRRRRRRRR : SECTION 13090 BORATED POLYETHYLENE Corporate Manufacturing 4140 Morris Drive 4140 Morris Drive Burlington, Ontario L7L 5L6 Canada Burlington, Ontario L7L 5L6 Canada Phone: (800) 381-5335 Fax: (905) 637-8841 E-mail: sales@ marsmetal.com PART 1 GENERAL Polyethylene is used to attenuate neutrons when no other hydrated barrier material is existing or available. It is used as a medical and industrial shielding material to attenuate and absorb neutron radiation. This easily fabricated polymer material also offers designers greater durability and function over a wider range of temperature than traditional materials. 1.1 ACCEPTABLE MANUFACTURERS Borated polyethylene shall be manufactured or supplied by MarShield Div. of Mars Metal Company. SUBMITTALS In accordance with conditions of the contract and Division 1, submit six (6) copies of product data sheets for each type of polyethylene sheet. PRODUCT HANDLING Up to 15 sheets or a maximum of 2,250 pounds shall be placed upon a wooden skid and stretched wrapped around all four sides. Three steel bands shall be fastened horizontally and one longitudinally. PART 2 PRODUCTS 5% BORATED POLYETHYLENE 5% borated polyethylene is typically manufactured in 1: thick sheets, 48 wide x 96 long, that is green in colour and weight approximately 150 lbs. per sheet. MarShield offers custom cutting services, as well as machining for close tolerances. PART 3 - EXECUTION EXAMINATION Inspect all surfaces and verify that they are in proper condition to receive the work of this section. PEPARATION During the operation of work of this section, protect existing work against damage by the exercise of reasonable care and precautions. Repair all existing materials which are damaged by Work of this section, to match original profiles and finishes. Existing materials repaired shall be removed and replaced with new work to match existing. INSTALLATION Install all shielding material as dictated by approved shop drawings. Where built-in items penetrate shielding provide additional shielding as required to maintain full continuity of barrier. Touchup shop applied primer. DIAGNOSTIC RADIATION SHIELDING CONSIDERATIONS All Lead Radiation Shielding requirements should be calculated and determined by a certified professional radiation health physicist based on the following information. ENERGY: The end user must determine the output of the X-Ray machine. (KvP). Usually, the higher the output of the machine, the higher the lead shielding requirement. EXPOSURE: The end-user must determine the exposure per hour, day, week and year and the maximum patient exposure accumulated and projected from radiation exposure, as radiation is cumulative and unnecessary extra exposure can cause biological damage on the cellular level. Each state or province has its own maximum permissible exposure level in addition to natural radiation exposure an average person is exposed to through environmental factors like ultra violet solar, radon gas and atmospheric radiation. Ensure you check with local governing health and safety laws and codes for current compliance requirements. ORIENTATION/DIRECTION: All wall sections shall be calculated by your physicists in relation to the direction of the primary beam target. (Direction where it is aimed) and scatter or secondary radiation of the x-ray machine, as well as the floor or wall. DISTANCE: Radiation dissipates as the distance increases; usually the closer a partition is to the radiation / x-ray source, the higher the lead shielding needed. OCCUPANCY OR ROOM USEAGE: A critical and very important factor in your calculations is the amount of time, per day, a surrounding or adjoining room common to the x-ray room will be occupied and used by your personnel or public. An example would be a simple storage room, which would have a lower use or occupancy factor, compared to a waiting room or office that would have higher use. Therefore, it is calculated room by room for all rooms connected or that are common to the x-ray room. If there is no occupancy potential, then typically no shielding will be specified or required. (I.E. Floor or roof of a single story building with no basement). CONSTRUCTION MATERIAL: Often a physicist will take into account the existing or the proposed construction materials used or to be used of the wall/partition or flooring material, as heavy density materials can attenuate (shield) radiation to a certain degree, such as concrete, steel, plaster, block or multiple layers of drywall. 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