An account is given of experiments proving the existence of a penetrating non-ionizing component of cosmic radiation at sea-level. It is shown that the radiation has a mean range of approximately 10 cm. in lead, and is probably the same as the penetrating non-ionizing radiation discovered by Rossi and Regener in, experiments at 4300 m. above sea-level. An argument is brought forward indicating that the radiation might consist of neutrons.
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Jánossy et al. (1943) studied this question.