R.G. Helmer

The quality of rivers: From pristine stage to global pollution

Michel Meybeck, R.G. Helmer · Palaeogeography Palaeoclimatology Palaeoecology · 1989 · 438 citations

River Basin Management, Engineering, Sediment Quality +7

Precise comparison and measurement of gamma-ray energies with a Ge(Li) detector II. 400–1300 keV

R.G. Helmer, R. C. Greenwood, R.J. Gehrke · Nuclear Instruments and Methods · 1971 · 204 citations

Experimental Nuclear Physics, Radiation Detection, Nuclear Physics +6

Precise relative γ-ray intensities for calibration of Ge semiconductor detectors

R.J. Gehrke, R.G. Helmer, R. C. Greenwood · Nuclear Instruments and Methods · 1977 · 194 citations

Precision Measurement, Engineering, Radiation Detection +11

Recommended standards for γ-ray energy calibration (1999)

R.G. Helmer, C. van der Leun · Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · 2000 · 170 citations

Calibration, γ-Ray Energy Calibration, Radiation Detection +1

Precise comparison and measurement of gamma-ray energies with a Ge(Li) detector I. 50–420 keV

R. C. Greenwood, R.G. Helmer, R.J. Gehrke · Nuclear Instruments and Methods · 1970 · 166 citations

Experimental Nuclear Physics, Radiation Detection, Nuclear Physics +5