Abstract: The present invention relates to the field of environment monitoring. The present invention solves the problem in the prior art of large errors arising when using spectrophotometry to monitor a water quality COD index, and provides a method for constructing a water quality index prediction model and a method for monitoring a water quality index.

Abstract: The present invention relates to the field of environment monitoring. The present invention solves the problem in the prior art of large errors arising when using spectrophotometry to monitor a water quality COD index, and provides a method for constructing a water quality index prediction model and a method for monitoring a water quality index.

Abstract: An air kerma conventional true value determining method is provided, which addresses the problem of on-site and in-situ verification or calibration of radiation protection with existing standard reference radiation, which is large in spatial volume and unable or difficult to be moved. The method includes establishing a minitype reference radiation, selecting a proper radiation source and source intensity for providing incident rays for a shielding box, selecting a plurality of gamma ray dosimeters as samples for training a prediction model to obtain the prediction model of the air kerma conventional true value of a point of test, putting a probe of a dosimeter being verified at the point of test, recording scattering gamma spectrum measured by a gamma spectrometer, with the spectrum applied as input to the prediction model to obtain the air kerma conventional true value. The results are accurate and the reference radiation is small in size.

Abstract: A measurement method for an air kerma conventional true value comprises: building a small-scale reference radiation field, then selecting a proper radiation source (4) and a source intensity for providing incident rays for a shielding box (1), subsequently selecting a plurality of gamma ray dose measurement instruments as experiment samples for building a prediction model to obtain a prediction model of the air kerma conventional true value of a check point, fmally placing a probe of an instrument to be detected on the check point (6), recording a scattering gamma spectrum detected by a gamma-ray spectrometer (9), and importing the prediction model to obtain the air kerma conventional true value. The method relates to the field of radiation protection detection or calibration, and has the beneficial effects that the result is accurate, the reference radiation field used is small in size, and the method is applied to measurement of the air kerma conventional true value.