Radiation Protection at Linear Electron Accelerator LINAC-800

Radiation Protection at Linear Electron Accelerator LINAC-800

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

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. 2/12


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 hazard factors calculations



Radiation control system configuration

• BDS-1M-63х63 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 МэВ; 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 control system scheme



Radiation control system configuration



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).



RadCtrl software



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.

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.



Thank you for your attention!



Radiation Protection at Linear Electron Accelerator LINAC-800

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