Identification of new arsenic isotopes in fission: 83As and 84As

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“…With modified versions, del Marmol & Neve de Mevergnies (171,172) and Tomlinson & Hurdus (173) have directly observed the fission products 2.0sec 85.8 6As and 1.7-sec 1 35Sb. Other groups have decomposed antimony hy dride in liquid absorbents (174)(175)(176) or have produced it by reduction with sodium borohydride (176).…”

A Rapid Radiochemical Separation Method for Selenium

“…Ge and Sn hydrides were also formed by the electrolytic method [6] and a slight amount of Ge by the zinc method [5], In a recent study of short-lived As isotopes isolated by the zinc method, a weak Se contamination was observed [7]; this could be avoided by passing the hydride gas mixture over NaOH pellets, which stopped the HaSe as well as appreciable amounts of the As and Sb hydrides. The present experiments show that it is sufficient to bubble the hydride gas mixture through water, to keep selectively in solution about 25% of the original selenium.…”