| 摘要 |
PURPOSE:To analyze the components in a material to be measured accurately, by obtaining the transmittances of a plurality of radiations, whose energy ranges are different, based on a radiation source, which generates both high-speed neutrons and gamma rays, a detector of both radiations, which have transmitted through a material to be measured, and signals from the detector. CONSTITUTION:A <252>Cf radiation source 10, which generates both high-speed neutrons and gammarays, is enclosed in a storing container 12. The radiations are suitably converged and projected on an object to be analyzed 18 on a belt conveyer 16 as radiation flux. The neutron beam 20 and the gamma rays 22, which have transmitted through the object 18, are detected by an organic scintillator 26 in a collimator 24, which is also used as a shield. The output of the scintillator 26 is made to pass through a photomultiplier 28 and a preamplifier 30. At first, one signal is guided to a pulse waveform discriminator 32, and either a high-speed neutron signal 34 or a gamma-ray signal 36 is generated. The other signal is made to pass through a linear amplifier 38 and a delay amplifier 40. Then the output of the amplifier 40 is guided to linea gate parts 42 and 44. The neutron beam becomes linear pulses 46 through the gate 42, and the gamma rays become linear pulses 48 through the gate 44. The values of the pulses 46 and 48 observed by the wave height analyzers 50 and 54 are computed by an operator 52, and the amounts of components are obtained. Thus the measurement can be continuously carried out. |
