Radiation Protection for PIMS prototype tests in the 3 MeV test stand, 23. July 2010

present: J.-M. Giguet, Th. Otto, C. Rossi, R. Wegner, M. Widorski

presentation on layout options

Conclusions:

  • chicane is not efficient because X-ray can escape with one bounce
  • access problem with chicane
  • => suggestion by Markus to close entrance with concrete block
    • + best shielding
    • + no access possible during test
    • - concrete block at entrance needs to be removed for any access to cavity (which should not be very often)
  • additional lead shielding in front of beam axis (hottest points)
  • wave guide passage will be monitored carefully
  • cables for radiation detectors will be connected at the same time as the cables for the RF pickups are placed
  • radiation levels will be monitored during the start up and during conditioning to guarantee safety especially for the corridor which is outside the controlled zone

Additional information (by M. Widorski):

  • For 1 MV X rays (with 5.6mm Cu/W filtering) one can expect a reduction factor of 3E-3. With 5 cm of lead an reduction of 6E-3 (lead only) can be expected.
  • The concrete wall + additional lead shielding on the beam axis should be sufficient regarding the estimated source term - and even provide an additional safety margin.

actions:

  • discussing which concrete blocks are available and reserving them
  • blocks of good state should be selected
  • organising lead blocks and supports
  • assembly of bunker will take a few days

summary: R. Wegner

-- FrankGerigk - 16-Aug-2010

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