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T-489: Induced Activity and Residual Dose Rates

T-489: Induced Activity and Residual Dose Rates. Johannes Bauer for T-489 experimenters prepared 3/19/2007. Irradiation Experiment in Endstation A Spring 2007. Motivation. Monte Carlo Simulations for Design of New Facilities Simulation of residual activity improved in last years

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T-489: Induced Activity and Residual Dose Rates

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  1. T-489: Induced Activity and Residual Dose Rates Johannes Bauer for T-489 experimenters prepared 3/19/2007 Irradiation Experiment in Endstation A Spring 2007

  2. Motivation Monte Carlo Simulations for Design of New Facilities • Simulation of residual activity improved in last years • Better-controlled experiments needed for benchmark tests CERN Involvement: • Four collaborators from CERN • Two years ago similar experiment at CERN with hadron beam • SLAC experiment complimentary with electron beam

  3. Experimental Setup Beam • Primary beam 28.5 GeV at 20 W average (up to 100 W temporarily), ~ 2x109 e-/pulse at 1 to 10 Hz (not exceeding 100 W) • Compatible with PEP2 and BABAR • Beams delivered to dedicated copper dump • Need to know absolute beam power to ~5% Equipment • Use of existing wire scanner 3WS1 and standard roller screens for beam monitoring and alignment • Use of existing toroids to measure current Infrastructure • Just standard beam delivery

  4. Samples at Dump Installation in beam line inside shielding tunnelof ESA Regularly controlled access to remove and replace samples Measurements of samples in Bldg.24

  5. Schedule Installation Official schedule: Mon/Tue April 2/3, 2007 (earlier if access to ESA possible) Beam Starting Wed April 4, 2007 for 5 to 7 days (earlier if beams available)

  6. Radiation Hazards Concrete in ESA Already irradiatedT-489 does not add much: < 0.01 mrem/h Equipment in ESA Also very little: ~ 0.13 mrem/h Dump 1 mrem/h at 30 cm distance off dump surface 13 mrem/h on contact Values for 100 hours cooling time

  7. Radiation Hazards (cont) Worst case radiation dose according to simulation, 4 days, 20 W, 15 min cooling time: Dump’s 30 cm dose rate: 70 mrem/h after 30 min cooling time 50 mrem/h after 1 hour cooling time 20 mrem/h after 10 hours cooling time

  8. Radiation Hazards (cont) Exposure during sample exchange (4 days of 20 W, 15 min cool-down): Training and rehearsals will be required Radiological postings and procedures worked out with RPFO

  9. Conclusion Radiological aspects under controlboth short-term and long-term No additional safety hazards (e.g. no earthquake bracing needed for equipment)

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