A simpler and improved utility approximate point scattered function for thin-fifilm converters currently used in neutron photographic devices is proposed as a correction method to produce clearer, more realistic images. The validity of the model was demonstrated through a simulation experiment. Based on the results, an error  analysis was carried out, certain corrections were made to the original model, and the fifinal model achieved a very low relative error in the simulation experiment. The model can also be optimized for quantitative neutron photographic analysis using iterative algorithms to obtain realistic neutron photographic images more quickly. At the end of the article, the model is extended to consider the case of energy spectrum hardening by introducing a temperature correction parameter.

Nuclear material license holder should develop a nuclear material accounting management system and achieve the closed balance. According to regulations requirements, nuclear material accountancy implementation is based on  physical inventory and material measurement. Generally, the spent fuel reprocessing plant operates uninterrupted, annual throughput of  nuclear  materials  is  huge, different  measurement and analysis techniques are configured combing the reprocessing process. So the closed balance approach of nuclear materials accounting is a great challenge. In order to improve  the accuracy and reliability of nuclear material, enhance the timeliness of abnormal detection, near-real time accounting prospect of spent fuel reprocessing plant was researched. In this paper, the crucial aspect affecting the closed balance of nuclear materials was discussed, the factors such as the head-end receiver-shipper difference, the on-line process monitoring accuracy, the applicability of the international target value of nuclear material measurement uncertainty, and also the nuclear material balance model of reprocessing plants. As summarized, proposed suggestions and solutions for nuclear material balance in spent fuel reprocessing plant was put forward on the end of the paper.

A dilation X-ray detector (DIXD) based on time dilation and microchannel plate (MCP) gated technology has been reported. The DIXD passes a driving pulse along the transmission photocathode (PC) to obtain a dilated electron signal and finally achieves a high time resolution of 12 ps. Furthermore, the waveform of the PC driving pulse can be obtained using the DIXD, and a DIXD oscillographic function can be obtained. An experiment is presented to demonstrate the DIXD oscilloscope. The waveform of the PC driving pulse from points t₁ to t₁₂ is achieved by the DIXD. The waveform agrees well with that measured by a high-speed oscilloscope with a difference of less than 6%. The maximum theoretical bandwidth of the DIXD oscilloscope is theoretically studied. The bandwidth is limited by the potential difference between the PC and mesh. When the potential difference is 3.4 kV, the theoretical limiting bandwidth is 1000 GHz. The bandwidth increases with an increase in the potential difference.