Abstract
IN order to investigate the β-radiation from active phosphorus, phosphorus pentoxide was irradiated with 5 MeV, deutrons (current approximately 40μ A.) in the cyclotron of this Institute. A very small fraction of the sample (about 0·01 mC.) in the form of Mg2P2O7 was placed between two foils of about 0.02 μ thickness, the preparation forming a narrow strip 7 mm. × 0.5 mm. It was then introduced into a β-spectrograph of the lens type1 with high intensity and good resolution (in this case 1·9 percent), and provided with a very thin foil (0·2 μ) in front of the Geiger-Müller counter. To obtain the true distribution curve, the number of particles counted must be divided by the corresponding value of Hρ. The spectrograph was calibrated by using the I line of thorium B, the energy of which had been determined as Hρ = 1750 in the semicircular spectrograph of the Institute.
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SIEGBAHN, K. β-Radiation from Active Phosphorus and Sodium. Nature 153, 221 (1944). https://doi.org/10.1038/153221a0
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DOI: https://doi.org/10.1038/153221a0
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