A novel spectral gamma logger is presented as a versatile instrument in laboratory or in situ gamma ray and K-U-Th concentration pattern logging. It includes an array of novel compact and high sensitivity radiation detectors embedded in efficient shielding and in a close contact with the measured sample (core). Its design minimizes the requirement for shielding size and weight while achieving the accuracy and precision of larger conventional setups.
The revolutionary modular architecture can combine a series of standardized instrumented segments to perform simultaneous measurements along core samples and provide customizable statistical precision. The performabce of the new logger is demonstrated on several real cores from the country.