Abstract: :This article mainly introduced the establishment of a protective level X-ray metrology laboratory, which verifies various performance indicators such as field diameter, uniformity, and scattered radiation through physical experimental methods. The results indicated that under the condition of narrow beam spectrum series X-ray reference radiation, the standard deviation between the measured N-60 spectrum and the theoretical curve was 0.54%. The contribution of scattered radiation was less than 3.4%. 95% field diameter at a 10 cm aperture in the N-100 spectrum was 9 cm. Conclusion: The X-ray metrology laboratory discussed in this article meets the requirements of GB/T 12162.1—2000 in terms of key technical indicators such as field diameter, field uniformity, and scattering.

Key words: X-ray, reference radiation field, field uniformity, field diameter, scattering