适量的微量硼将对作物有增产作用。由于硼的热中子(n,α)反应截面很大,因此,利用核反应来测定土壤中和植株内的硼含量将是可行的。 用火花计数测量α径迹需要精确的蚀刻条件,因为被蚀刻膜的剩余厚度与火花计数有关,而蚀刻剂的浓度、温度都可以敏感地影响到被蚀刻膜的剩余厚度。对于聚碳酸酯膜,用NaOH The right amount of trace boron will increase the yield of crops. Since the thermal neutron (n, α) reaction cross section of boron is very large, it is feasible to determine the boron content in soil and in plant by nuclear reaction. Accurate etching conditions are required to measure the alpha track with a spark count because the remaining thickness of the film to be etched is related to the spark count while the concentration and temperature of the etchant can sensitively affect the remaining thickness of the film to be etched. For polycarbonate membranes, NaOH is used