Collimated neutrino beams in the energy range 1 to 100 gigaelectron volts, now available from high-energy proton accelerators, are proposed as a potential means for telecommunication over global distances. Quantitative estimates of the feasibility of this proposal based on a particular detector configuration are presented.

The absol ute emissio n rate of ne ut rons fr om t he National Bureau of Standa rds rad iumber yllium p hotoneutron standard source has been determined from t he volume in teg ra l of t he neu tr on absorp tion rate in wat er . Thin ind ium a nd manganese fo ils were employcd to m easure the t hermal-ne utron d ensity as a fun ction of distance fro m t he source. The foil activities were converted to neu tron d ensities by cali bration of the foils in a reference t hermalne u tr on fl ux p reviously calibrated with boron films. A m otor dri ven m ec ha nical integra t or , which m oves foils radi ally from t h e so urce a t a rate that takes into acco unt the incr ease in area wi th d istance from the so urce and t he decay of t he fo ils, provided over 80 percc nt of t he volume integ ral. A value of 1. 265 X 106 ne utrons per second was d etermincd for t he emission rate of t hc phot oneutron stand ard, wit h a n estimated standard error of 3 percent.

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