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In the majority of reactors, a proportion of the combustible neutron poisons is incorporated into the fuel rods with the intention of increasing their burnup depth, thereby extending the operational lifespan of the core and enhancing the economic efficiency of the process. Erbium (Er) is a common combustible neutron poison, and in order to address the issue of on-line monitoring of the Er elemental content during the production of such fuel rods, a solution must be found. A novel approach, namely Prompt Gamma-ray Neutron Activation Analysis (PGNAA), is employed, which is well-suited to large-volume samples and can be detected online. Utilising the americium-beryllium (AmBe) isotope neutron source and high-purity germanium to establish an experimental measurement platform, with erbium oxide (Er2O3) selected as the sample. This is also combined with the MCNP to perform simulation calculations. The results demonstrate that the mass and the net area of the characteristic peaks of the sample exhibit a linear variation after correction for neutron self-shielding. The mass detection limit of the platform for erbium was 24.2 g, with a relative standard deviation of 3.65% and a relative error of 3.47%. The accuracy and precision were affected by the statistical fluctuations inherent to the data set. Subsequent optimisation of the equipment will enhance the accuracy and precision. The results demonstrate the feasibility of this method for online monitoring and establish a foundation for the subsequent use of thermal neutrons to measure the elemental content of erbium and to correct the neutron self-shielding effect of large-volume samples.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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