Century Geophysical - Model 7201 -Spectral Gamma Logging Device for Geological Formation

The Spectral Gamma tool model 7201 provides a three-channel analysis of the gamma ray spectrum focusing on potassium, uranium, and thorium content in geological formations. It utilizes an internal energy source of less than 1 micro-curie of Cs137 to excite the crystal and stabilize the electronics before logging. The tool captures the spectral window using a 256-channel spectrum board, enabling detailed analysis of different energy levels in the formation. Key benefits include fully downhole digital capabilities, quick automatic setup with unique tool identification, and the fact that it is designed for one-man operations. The tool can also be customized to meet specific needs. The device measures key properties such as potassium percentage and uranium and thorium parts per million at an offset of 135.63 cm. The tool's specifications include a length of 167 cm, a diameter of 60.96 mm, and an operational temperature up to 65°C. It is pressure-rated at 232 kg/cm2 and weighs 16.82 kg. The tool operates at a logging speed of 1.5 meters per minute and requires a voltage of 60 VDC.