Abstract
KNOWLEDGE of the emission of slow neutrons by sources is essential wherever effective slow-neutron cross-sections much exceed fast-neutron cross-sections. The investigation of the Szilard–Chalmers effect on manganese and arsenic with fast neutrons is an example1–4. We have now measured the emission of slow neutrons, in three energy channels (resonance bands of dysprosium, indium, iodine), by a ‘natural source’ of the common type. The source consisted of 300 mgm. radium as the chloride, mixed with an excess of beryllium metal (2–3 gm., but exact amount unknown), and was contained in a platinum capsule of 0.025 cm. wall thickness. Total neutron emission was of the order of 3 × 106 sec.−1, that is, equivalent to that of about 200 mC. radon–beryllium5.
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