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Temporary shielding for the 20" vertical penetration

This report details the temporary shielding design for a 20" vertical penetration as investigated by Igor Rakhno on November 17, 2008. The study includes elevation views and cross-section diagrams of a vertical vent in the MTA hall, as well as a plan view of the temporary shielding utilizing a 1-cm Cu target. Calculated radiation doses indicate 50 mrem/hr at the top of the shielding and 80 mrem/hr at the opening. The report also examines the impact of pulse rates on dose exposure near side walls and provides comprehensive shielding designs and configurations.

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Temporary shielding for the 20" vertical penetration

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  1. Temporary shielding for the 20" vertical penetration Igor Rakhno November 17, 2008

  2. Vertical vent in MTA hall, 20" (elevation view)

  3. Vertical vent in MTA hall, 20" (cross section)

  4. Plan view of the temporary shielding

  5. 1-cm Cu target (10% of I.L.) @ 1 Hz (DC loss) • Calculated dose on top of the temporary shielding is 50 mrem/hr • Calculated dose at the opening is 80 mrem/hr → extra bent section(0.1) • Calculated dose near the side walls is 10 mrem/hr • When considering a 100% I.L. target and rep.rate of 3 pulses per minute (1 pulse every 20 sec), one gets approximately 50 × 10 / 20 = 10 mrem/hr • Radiation area (fencing)

  6. Shielding block in the access pit (cross section)

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