伽玛能谱探管设计

N761四道γ能谱测井探管是用于测量总计数率及铀、钍、钾放射性元素含量的测井仪器,配接在核工业北京地质研究院开发的HD-4002测井系统中,本探管采用双CPU结构,提高了系统的集成度,主CPU进行测量和自动稳谱,辅CPU对来自主CPU的测量数据进行并/串转换和码形变换,经铠装电缆传输到地面系统中,通过采用改进的自动稳谱技术,探管能够在较宽的环境温度范围(0℃～50℃)内自稳,各参数的记数偏差在8%以下,测井探管工作稳定,本探管经野外试验考核达到设计标准.

Design of gamma ray spectrometer probe

N761 probe, assumed to be equipped in HD4002 Well logging system which Beijing Research Institute of Uranium Geology developed, is applied to measure Gross count rate, concentration of Uranium, Thorium and Potassium radioactive elements, It has two CPU configuration, master CPU realizes the functions such as parameter survey and spectrum auto-stabilization; and auxiliary CPU fetches in parallel mode measurement result from master CPU and transfers serially to armored cable, resulting in probe high integrity; N761 probe features that wide operation temperature range and stability are accomplished thru improved spectrum auto-stabilization technique. Within the range in temperature from 0 to 50 Celsius degree, the statistics deviation of count rate of Gross Count, Uranium, Thorium and Potassium are all below 8%. Additionally, N761 can automatically search Signature of ¹³³Ba source and store in EEPROM.