Establishment of ISO 4037-1 X-ray narrow-spectrum series

In order to calibrate radiation protection instruments and determine radiation dose, it is critical to establish an X‐ray narrow‐spectrum series recommended by the standard ISO 4037‐1 which is published by the International Standardisation Organisation (ISO). By experiment, the qualities of filtered X radiation of narrow‐spectrum series in the range from 60 to 300 kV were established. The differences of the first half‐value layer (HVL1) and the second HVL (HVL2) between experimental results and the values given in the standard ISO 4037‐1 were all within 5%. What is more, the Monte Carlo code EGSnrc was used to simulate the spectra of these radiation qualities, which showed a good agreement with these spectra given in the standard ISO 4037‐1. The spectral resolution, mean energy and effective energy of these reference qualities can be obtained, which are all have good agreement with the given values.

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