Abstract
An adiabatic calorimeter has been designed for measuring energy absorbed in materials (C, Al, (CH2)n and Pb) placed in the experimental hole of a nuclear reactor.Details are given of the apparatus and procedures of the calorimeter, followed by an account of the results of calibration and of dosimetry in the TRIGA II type reactor of the Atomic Energy Research Laboratory of the Musashi Institute of Technology, The operating temperatures were 25 ?? -30 ?? at 100kW reactor power, and the energy deposition (or dose) rate was 0.2-2mW/g. The performance has been satisfactory in spite of the poor agreement between the observed and calculated rates of temperature rise. The ratio between energy absorption due to fast neutron scattering and that due to γ-rays obtained in the TRIGA II is consistent with the data obtained with BEPO. The experimental accuracy (standard error) at full reactor power is estimated to be within 2.1%.
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