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Temporary shielding for the 20" vertical penetration

Temporary shielding for the 20" vertical penetration. Igor Rakhno November 17, 2008. Vertical vent in MTA hall, 20 " (elevation view). Vertical vent in MTA hall, 20 " (cross section). Plan view of the temporary shielding. 1-cm Cu target (10% of I.L.) @ 1 Hz (DC loss).

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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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