Abstract: An apparatus for determining the dose equivalent and dose rate equivalent neutrons, which includes a detector for absorbing neutrons and emitting voltage pulses. The detector is surrounded by a mantle for moderating purposes and for absorbing neutrons. The detector is followed by amplifying means for amplifying the voltage pulses emitted by the detector while a voltage discriminator receives the amplified voltage pulses. The voltage discriminator is followed by recording means for registering the time average number of the voltage pulses emitted by the voltage discriminator while the detector for neutrons with energies up to at least 10.sup.6 eV emits voltage pulses, the height of which, depends both on the energy freed by the nuclear reaction initiated by the absorbed neutrons and on the kinetic energy of the absorbed neutrons. The number of these voltage pulses shows a maximum.