Kumamoto Y, Maruyama T
Health Phys. 1982 Nov;43(5):719-26. doi: 10.1097/00004032-198211000-00010.
Electrochemical etching of polycarbonate foils was performed using a KOH solution with various concentrations of ethyl alcohol under different conditions of field strength, frequency, temperature and etching time to register alpha-particles from a 10B radiator positioned in the center of a 25-cm diameter polyethylene sphere. These studies showed that the highest neutron sensitivity relative to the inherent background in the foil was obtained under the following etching conditions: 32 kV/cm, 1 kHz, 30 degrees C, 2 hr in a solution of 35 gm KOH + 25 cm3 C2H5OH + 75 cm3 H20. Under these conditions, 1 mrem of neutrons from a Ra-Be source gave 155 pits per cm2 while background was 1-3 pits per cm2. The pit diameters were about 75 microns. The dose can be measured to an uncertainty of +/- 100% at 0.1 mrem and +/- 10% at 1 mrem. This method was used to measure the natural neutron background and gave 17 pits per cm2 (0.1 mrem +/- 0.1 mrem) per month in a building.
在不同的场强、频率、温度和蚀刻时间条件下，使用含有不同浓度乙醇的氢氧化钾溶液对聚碳酸酯箔进行电化学蚀刻，以记录位于直径25厘米的聚乙烯球中心的硼 - 10辐射源发射的α粒子。这些研究表明，在以下蚀刻条件下可获得相对于箔片中固有本底的最高中子灵敏度：在35克氢氧化钾 + 25立方厘米乙醇 + 75立方厘米水的溶液中，场强32千伏/厘米、频率1千赫、温度30摄氏度、蚀刻2小时。在这些条件下，来自镭 - 铍源的1毫雷姆中子产生每平方厘米155个蚀坑，而本底为每平方厘米1 - 3个蚀坑。蚀坑直径约为75微米。在0.1毫雷姆时剂量测量的不确定度为±100%，在1毫雷姆时为±10%。该方法用于测量天然中子本底，在建筑物中每月得到每平方厘米17个蚀坑（0.1毫雷姆±0.1毫雷姆）。
