ESR INVESTIGATION OF JOINT USE OF DENTIN AND TOOTH ENAMEL TO ESTIMATE PHOTON AND NEUTRON DOSE COMPONENTS OF A MIXED FIELD
F. Trompier, D.D. Tikunov, A. Ivannikov, I. Clairand, 14th conference on solid state dosimetry, 27/06-02/07 2004, Yale, USA.
Accidental ESR retrospective dosimetry using tooth enamel is a proven technique for photon exposure. Exposure may also occur with a neutron component. Recently, some authors described a low sensitivity of enamel to neutrons and no shape modification in the ESR spectrum. In these conditions, estimation of photon and neutron dose components from the ESR signal of tooth enamel alone is impossible. In order to overcome this difficulty, a second dosimeter with a higher sensitivity to neutrons could be used following dose estimation method described in ICRU 26 for twin chambers. In that way, neutron sensitivity of dentin to neutrons was then evaluated in this work and found six times higher than for enamel. The joint use of dentin and enamel was evaluated in criticality accident conditions. Estimation of neutron and photon dose components was found in good agreement with reference dosimetry.