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Muon Pits Residual Dose Rates Analysis at SBLNF: Preliminary Results & Recommendations for Radiation Protection

Explore the residual dose rates at muon pits & downstream of the hadron stopper during SBLNF operation. Analyzing beam momentum, density profiles, and irradiation effects. Initial results show elevated dose rates requiring enhanced MC techniques for accurate statistics. Recommendations propose safety measures accommodating potential power increase without compromising radiation safety.

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Muon Pits Residual Dose Rates Analysis at SBLNF: Preliminary Results & Recommendations for Radiation Protection

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  1. Residual dose rate at the muon pits &dose rate downstream of the hadron stopper during operation of SBLNF Heinz Vincke, DGS/RP, SBLNF meeting 5.12.2012

  2. some parameters • Beam momentum 100 GeV/c • Beam intensity 4.5×1013 p/3.6s  200 kW • Irradiation profile: 180 days of continues beam • Density of Moraine 1.9 gcm-3

  3. Ambient dose equivalent rate at muon pits (1 week cooling) - preliminary results More CPU time/MC–techniques needed to improve statistics  preliminary results Presented in the last meeting • After 1 week of decay: • 1st muon pit: • A few hundred uSv/h inside • ~30 uSv/h at ‘border’ to iron • 2nd muon pit: • OK Hadron stop 2ndmuonpit 1stmuonpit Hadron stop Decay tunnel

  4. Ambient dose equivalent rate in the muon pits(final results) H*10 (after 1week of decay) • … same conclusion as before: • (after 1 week of decay) • 1st muon pit: • A few hundred uSv/h inside • ~30 uSv/h at ‘border’ to iron • 2nd muon pit: • OK Concrete shielding Fe of HS 2ndmuonpit 1stmuonpit Fe of HS End of decay tunnel C-core of HS

  5. Dose rate during beam Position of EHN1? 100 GeVmuon ranged out at 320 m (see M. Calviani’s talk from 19.10.2012) …. at a distance of ~280 m (from target) dose rate < 1 uSv/h EHN1 has ‘permanent workplaces’ with an ambient dose rate limit of 3 uSv/h.

  6. Dose rate during beam (100 GeV/c, 4.5E13 ppp/3.6s->200kW) z- distance from target 3 uSv/h 1 uSv/h • … proposal to use (at least) the 1 uSv/h limit: • to have a safety factor • to allow a possible increase to 300 kW • without RP consequences for EHN1 (radiological re-classification, restricted access in EHN1, etc).

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