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Thermoluminescent dosimetry at the IFJ Krakow

Thermoluminescent dosimetry at the IFJ Krakow. P. Bilski, B. Obryk. INSTITUTE OF NUCLEAR PHYSICS (IFJ) , KRAKÓW, POLAND. RADMON, 15 February 2006. belongs to Polish Academy of Sciences - founded 195 5 - 450 personnel ( 180 with Ph.D.) - main research interest : particle physics

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Thermoluminescent dosimetry at the IFJ Krakow

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  1. Thermoluminescent dosimetry at the IFJ Krakow P. Bilski, B. Obryk INSTITUTE OF NUCLEAR PHYSICS (IFJ), KRAKÓW, POLAND RADMON, 15 February 2006

  2. belongs to Polish Academy of Sciences -founded 1955 -450 personnel (180 with Ph.D.) - main research interest: particle physics nuclear physics theoretical physics solid state physics interdisciplinary research -facilities: V-d Graaff (2.5 MeV proton) cyclotron (60 MeV p, 30 MeV d) Thermoluminescent dosimetry at the IFJ Krakow P. Bilski, B. Obryk INSTITUTE OF NUCLEAR PHYSICS (IFJ), KRAKÓW, POLAND RADMON, 15 February 2006

  3. Thermoluminescent dosimetry at the IFJ Krakow 40 years of experience in TL dosimetry: first LiF crystals for dosimetry were developed in Krakow in 1960s Our activities: • Research on thermoluminescence phenomena • Development of new materials, detectors and methods • Application of TLDs in various dosimetric measurements • Dosimetric service

  4. DOSIMETRIC SERVICE Laboratory for Personal and Environmental Dosimetry (LADIS) • Started in 2002 • Accredited according to the ISO/IEC 17025 standard • 13000 monitored persons or environmental sites • - including 1000 CERN dosimeters • Equipment: • 3 Rados DOSACUS automatic readers • 3 manual readers • Rados dosimeter holders Calibration: with gamma-rays in the accredited Secondary Standard Calibration Laboratory at the IFJ (LWPD)

  5. Advantages of TLD • Very small dimensions (standard 4.5x0.9 mm, but even < 1 mm3 is possible) • Passive - no cables, no power supply, etc • Wide range of measured doses • Relatively resistant to environmental factors ( e.g. no influence of electric and magneticfield, vibrations; only elevated temperature is a limiting factor) • Practically unlimited period of measurement (years)

  6. Space experiment MATROSHKA 2.4 years measuring period A human phantom exposed outside of the International Space Station 2003-2006 Over 3000 TLDs from Krakow

  7. LITHIUM FLUORIDE The most widely used TL detector Two types:LiF:Mg,Ti (”standard”) MTS LiF:Mg,Cu,P (”high-sensitive”) MCP Tissue equivalent - atomic number close to tissue (important for X-rays) Li-6 and Li-7 isotopes make it possible to measure a low-energy neutron signal

  8. DOSE RESPONSE OF TLDs CMS expected dose range Ch. Ilgner, RADMON, July 2006 What doses can be measured with LiF TLDs?

  9. DOSE RESPONSE OF TLDs

  10. DOSE RESPONSE OF TLDs LiF:Mg,Cu,P LiF:Mg,Ti

  11. DOSE RESPONSE OF TLDs LiF:Mg,Cu,P thermoluminescence glow-curves 0 – 1 kGy 1 - 50 kGy 50 – 500 kGy LiF:Mg,Cu,P ? ? ? ? ? LiF:Mg,Ti

  12. DOSE RESPONSE OF TLDs 0 – 1 kGy 1 - 50 kGy 50 – 500 kGy LiF:Mg,Cu,P from µGy to MGy => 12 orders of magnitude!

  13. THE PROPOSED LHC DOSIMETER natLiF:Mg,Ti One test detector to check the dose level - read out automatically Its results will decide about choice of readout method for the rest of detectors Two detectors for lower/intermediate doses: e.g. 6LiF/7LiF pair One „high-dose detector”, to be read out by special procedure 7LiF:Mg,Cu,P or natLiF:Mg,Cu,P

  14. 15.5Gy 45Gy 12Gy 48Gy 17.5Gy 25Gy 28Gy 14Gy 6 exposures: 4.1 Gy 3.6 Gy 3.7 Gy 3.7 Gy 110 Gy 55 Gy CERF October 2006 RUN Preliminary results

  15. CONCLUSIONS • IFJ Krakow is technically well prepared for dosimetric measurements for LHC • The newly developed method using LiF:Mg,Cu,P detectors enables measurements far above 1kGy, • i.e. the present TLDs’ dose limit • Further calibrations at the highest doses are planned

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