Measurement of linear energy transfer distribution at CERN-EU high-energy reference field facility with real-time radiation monitoring device III and its comparison with dosimetric telescope

The distributions of linear energy transfer for LET (LET_water) in front of the 80-cm-thick concrete side shield at the CERN-EU high-energy reference field (CERF) facility were measured with a Si detector telescope named real-time radiation monitoring device-III (RRMD-III) covered with and without a 1 cm-thick acrylic plate. In these measurements, a difference of about 20% in the absorbed dose between the two LET_water distributions was observed as a result of protons, deuterons and tritons recoiled by neutrons. The LET_water distribution obtained using RRMD-III without the 1-cm-thick acrylic plate is compared with lineal energy distributions obtained using the dosimetric telescope (DOSTEL) detector under the same conditions. These dose equivalents are also compared with that obtained using HANDI TEPC which is used as the standard at the CERF facility.