Microdosimetric measurements in the thermal neutron irradiation facility of LENA reactor

P. Colautti, D. Moro, S. Chiriotti, V. Conte, L. Evangelista, S. Altieri, S. Bortolussi, N. Protti, I. Postuma

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

A twin TEPC with electric-field guard tubes has been constructed to be used to characterize the BNCT field of the irradiation facility of LENA reactor. One of the two mini TEPC was doped with 50ppm of 10B in order to simulate the BNC events occurring in BNCT. By properly processing the two microdosimetric spectra, the gamma, neutron and BNC spectral components can be derived with good precision (~6%). However, direct measurements of 10B in some doped plastic samples, which were used for constructing the cathode walls, point out the scarce accuracy of the nominal 10B concentration value. The influence of the Boral® door, which closes the irradiation channel, has been measured. The gamma dose increases significantly (+51%) when the Boral® door is closed. The crypt-cell-regeneration weighting function has been used to measure the quality, namely the RBEμ value, of the radiation field in different conditions. The measured RBEμ values are only partially consistent with the RBE values of other BNCT facilities.

Original languageEnglish
Pages (from-to)147-152
Number of pages6
JournalApplied Radiation and Isotopes
Volume88
DOIs
Publication statusPublished - Jun 2014
Externally publishedYes

Keywords

  • BNCT
  • Microdosimetry
  • Twin TEPC

ASJC Scopus subject areas

  • Radiation

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