Fields of view of airborne gamma-ray detectors; discussion and reply

In March, 1971, I presented a paper entitled “Calculation of airborne radioactivity survey responses: Theory, method, and field test,” before the AIME at its annual meeting in New York. I note that two recent publications in GEOPHYSICS reference it: “Fields of view of airborne gamma-ray detectors,” by Grasty et al (August 1979), and “Design parameters for aerial gamma-ray surveys,” by Pitkin and Duval (September 1980). The recognition in each case is appreciated.