A guide to the measurement of environmental gamma-ray dose rate /
Spiers, F. W.(Frederick William),1907-
Gibson, J. A. B.(John Anthony Beresford)
Thompson, I. M. G.
National Physical Laboratory (Great Britain)
British Committee on Radiation Units and Measurements.
Teddington : National Physical Laboratory on behalf of the British Committee on Radiation Units and Measurements,
1981.
Gamma rays