Radiation Protection at Linear Electron Accelerator LINAC-800

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Radiation Protection at Linear Electron
Accelerator LINAC-800
September 17-21, Alushta, Ukraine
N.I. Balalykin, V.Ph. Minashkin, M.A. Nozdrin,
G.D. Shirkov, V.Yu. Schegolev Veksler and
Baldin Laboratory of High Energies Joint
Institute for Nuclear Research Alushta 2011
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September 17-21, Alushta, Ukraine
Abstract
Automated system of radiation safety control
(ASRSC) of linear electron accelerator LINAC-800
is designed for staff securing during regular
accelerator operation and in emergency cases.
Emission power calculation results used in ASRSC
development are given. Both hardware and software
components of radiation control system are
described. Also, interlock and signalization
system description is presented.
Radiation Protection at Linear Electron
Accelerator LINAC-800. M. Nozdrin, JINR LHEP.
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September 17-21, Alushta, Ukraine
Introduction
Linear accelerator of electrons LINAC-800 is
based on a part of accelerator equipment which
was transferred to the possession of JINR by The
National Institute for Nuclear Physics and High
Energy Physics (NIKHEF, Amsterdam). It should be
mentioned, that radiation control equipment was
not transferred because it is not certified for
usage in Russia.
Maximum electron energy, MeV 800
Pulse duration, us 1 10
Pulse repetition rate, Hz 3 10
Pulse current, mA 40
Average leakage currents during operation, uA 0.4
Emergency charge losses in a 1-10 us time, nC less than 50
Accelerator length, m 200
Radiation Protection at Linear Electron
Accelerator LINAC-800. M. Nozdrin, JINR LHEP.
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September 17-21, Alushta, Ukraine
Radiation hazard factors calculations
Radiation Protection at Linear Electron
Accelerator LINAC-800. M. Nozdrin, JINR LHEP.
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September 17-21, Alushta, Ukraine
Radiation control system configuration

• BDS-1M-63?63 scintillation detection units (7
  pcs., the range of registered photon energies is
  0.16 5 MeV)
• UDBN-01-01 neutron radiation detection devices
  (2 pcs., the range of measurement of the power of
  ambient dose eqivalent is 0.1 104 uSv/h, the
  range of registered energies is 0.025 eV 14
  MeV)
• BPK-02 power supply and commutation unit
• Computer with an uninterruptible power supply
• RadCtrl software
• RS-485 serial communication line
• DKS-AT1123 portable X-ray and gamma radiation
  dosimeter (the range of registered energies is
  0.015 10 ??? the range of measurement of the
  power of ambient dose eqivalent is 50 nSv/h 10
  Sv/h for continuous radiation and 0.1 uSv/h 10
  Sv/h for pulse radiation with pulse length of 10
  ns and longer).

Radiation Protection at Linear Electron
Accelerator LINAC-800. M. Nozdrin, JINR LHEP.
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September 17-21, Alushta, Ukraine
Radiation control system scheme
Radiation Protection at Linear Electron
Accelerator LINAC-800. M. Nozdrin, JINR LHEP.
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September 17-21, Alushta, Ukraine
Radiation control system configuration
Radiation Protection at Linear Electron
Accelerator LINAC-800. M. Nozdrin, JINR LHEP.
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September 17-21, Alushta, Ukraine
RadCtrl software

• Software has the following features
• Current readout of all ASRSC LINAC-800 detection
  units displaying both in graphic and numeric
  form.
• Threshold crossing signalization.
• Detector disconnect signalization.
• Object scheme displaying possibility.
• Measurements archive for chosen detector
  possibility. Archive can be saved in MS Excel
  format.
• Thresholds changing, scale changing
  (linear/logarithmic).

Radiation Protection at Linear Electron
Accelerator LINAC-800. M. Nozdrin, JINR LHEP.
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September 17-21, Alushta, Ukraine
RadCtrl software
Radiation Protection at Linear Electron
Accelerator LINAC-800. M. Nozdrin, JINR LHEP.
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September 17-21, Alushta, Ukraine
Interlock and signalization system

• Interlock and signalization system is designed
  for continuous work due accelerator complex
  operation and should answer the following
  purposes
• Staff entrance in zones with increased ionizing
  radiation level prevention
• Staff warning about possible radiation danger by
  sound and light signalization.

Radiation Protection at Linear Electron
Accelerator LINAC-800. M. Nozdrin, JINR LHEP.
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September 17-21, Alushta, Ukraine
Conslusion

• Detectors of ASRSC of linear electron
  accelerator LINAC-800 have been calibrated and
  checked at JINR Radiation Safety Department
• ASCRC has been mounted in bld. 118 of Laboratory
  of Neutron Physics and have been put into
  operational testing.

Radiation Protection at Linear Electron
Accelerator LINAC-800. M. Nozdrin, JINR LHEP.
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September 17-21, Alushta, Ukraine
Thank you for your attention!
Radiation Protection at Linear Electron
Accelerator LINAC-800. M. Nozdrin, JINR LHEP.
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