Radiation monitoring in lhc experiments
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Radiation Monitoring in LHC Experiments. Three different aims: measurement of Beam-conditions (  beam abort) Radiation to components during operation TID ≠ NID high dose rates  monitors high doses  passive dosimeters Remnant radioactivity during personnel access

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Radiation Monitoring in LHC Experiments

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Radiation monitoring in lhc experiments

Radiation Monitoring in LHC Experiments

Three different aims: measurement of

Beam-conditions ( beam abort)

Radiation to components during operation

TID ≠ NID

high dose rates  monitors

high doses  passive dosimeters

Remnant radioactivity during personnel access

only gammas, low dose rates  ionizing chambers


Radiation monitoring in lhc experiments

1- Beam-Condition Monitoring

  • Fast active monitors (sensors)

  • Positioned close to the beam pipe

  • Real-time radiation monitoring to detect ‘anomalies’ and initiate protection procedures* for detector subsystems at the onset of beam instabilities and accidents

    * still to be discussed; alarm, beam abort, detector(s) shut-down via DSS… (?)


2 radiation to components f ravotti s presentation at rad mon meeting dec 2

2- Radiation to componentsF.Ravotti’s presentation at Rad-Mon meeting Dec.2

  • Total Ionizing Dose (TID) measurement:

    • Radiation Field Effect Transistors (RadFETs);

    • Optically Stimulated Luminescent materials (OSLs);

  • 1-MeV neutron equivalent fluence (Feq) measurement:

    • p-i-n diodes & PAD structures;

  • Thermal neutrons detection (Fth);


Radiation monitoring in lhc experiments

2- Radiation to components F.Ravotti’s Conclusions

  • Several techniques for the ACTIVEmonitoring of TID, FeqandFth

  • All presented devices are reliable and were characterized in various radiation fields;

  • Most of them are commonly used in Medicine and Space:

    customization and calibration for CERN applications needed;

  • ACTIVE monitors are also PASSIVE dosimeters

    More on: http://cern.ch/lhc-expt-radmon & http://www.cern.ch/irradiation


Radiation monitoring in lhc experiments

2- Radiation to components, Passive Dosimeters for TID

  • PAD = Polymer-Alanine Dosimeters1 Gy – 200 kGyadapted for plastics ; not well adapted to Si

  • RPL = radio-photo-luminescent dosimeters0.1 Gy – 1 MGy

  • TLD = thermo-luminescent dosimeters1 mGy – 1 Gycan also discriminate thermal neutrons

  • HPD = Hydrogen-pressure dosimeters 10 kGy – 10 MGy adapted for plastics ; not well adapted to Si

    + some active monitors adapted for Si1 cGy – 1 kGy


Radiation monitoring in lhc experiments

2- Radiation to components, Passive Dosi. for Neutrons

  • PIN-Diode , several type, well adapted to Si

  • Activation detectors = foils of pure metal which become radioactive

Passive  Active Dosimeters

  • Active = online measurement of dose rates (to be cabled)

  • Passive = offline measurement of doses (no cable needed)


Radiation monitoring in lhc experiments

3- Monitors for induced activity


Radiation monitoring in lhc experiments

3- Monitors for induced activity


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