Beam loss in a particle accelerator generates a pulsed neutron radiation field. However, the pulse-counting neutron rem counter faces significant issues with missing counts.

This study aims to address the issue of missing counts and achieve accurate measurements of pulsed neutron radiation doses.

Firstly, based on the physical mechanisms behind low current generation in nuclear reactions, a detection physical model was established that utilized the charge generated by neutron nuclear reactions as a reference quantity for measuring neutron interactions. Then, an integrating electronic system capable of accurately measuring low current and charge was independently developed. Finally, a method for measuring intense pulsed radiation fields was implemented, and experimental tests were conducted at the China Spallation Neutron Source (CSNS).

Experimental results at CSNS demonstrate that the number of nuclear reactions in a single pulsed neutron storm reaches up to103. The dose rate varies from μSv?h^-1 to several hundred mSv?h^-1, with pulsed neutrons observable on a millisecond timescale. The measured values closely align with simulated values, exhibiting a discrepancy of less than 50%.

This study not only addresses the gap in pulsed neutron measurement capabilities in China, but also fulfills the urgent needs of the CSNS.