T-489: Induced Activity and Residual Dose Rates - PowerPoint PPT Presentation

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T-489: Induced Activity and Residual Dose Rates

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Simulation of residual activity improved in last years ... (worst case stainless steel ) 130 mrem/h. Dump. Dump's 30 cm dose rate: ... – PowerPoint PPT presentation

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Title: T-489: Induced Activity and Residual Dose Rates


1
T-489 Induced Activity and Residual Dose Rates
  • Irradiation Experiment in Endstation A Spring 2007

Johannes Bauer for T-489 experimenters prepared
3/19/2007
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 lt
    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
contact 30 cm
Dump 2000 mrem/h 130 mrem/h
sample (worst case stainless steel ) 2 mrem/h 0.02 mrem/h
Dumps 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)
Task Dose rate Time Dose
Approaching dump 1 mrem/h 1 minute 0.017 mrem
Exchanging sample 130 mrem/h 20 seconds 0.72 mrem
Leaving dump 1 mrem/h 1 minutes 0.017 mrem
Total 0.76 mrem
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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