The distribution of cosmic ray neutrons in the atmosphere.

TL;DRAbstract

An introduction to the demography of cosmic ray neutrons including a detailed description of neutron diffusion theory with special reference to diffusion in the atmosphere. The design and performance of the detectors, flight unit electronics, telemetry system and receiving and recording equipment are described. The theory of frequency division multiplexing methods is described and applied to the optimisation of the telemetry system used in the experiments. The experiments are described and smoothed for curve counting rate dataAa number of the balloon ascents tabulated. The energy sensitivity of the neutron detectors is discussed. Experimental data on the background and directional response of the detectors are presented and analysed. The contribution to the counting rate of neutrons produced in the detector materials is estimated for various altitudes and latitudes. An increase in the neutron counting rate at high altitudes over Macquaries Island is described. This event occured at a t

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