Induced Radioactivity in Strontium and Yttrium

Discovery of yttrium, zirconium, niobium, technetium, and ruthenium isotopes

“…This half-life agrees with the half-life of the ground state (64 h). The observation of 90 Y was also reported independently two months later by Stewart et al[42].…”

“…In 1937 Stewart et al assigned a 120(4) min half-life incorrectly to 88 Y [42]. A 105-day activity had been observed previously, but had been assigned to 86 Y [36].…”

Some problems in the chemistry of uranium and thorium of interest to the development of atomic power

“…range of the beta particles (grams Al/cm^)^ is the maximum energy of the radiation (Mev). g'eather determined the equation experimentally by plotting the ranges (maximum penetration through aluminum) of mono-> energetic beta particles as a function of their energy.The beams of monoenergetic beta particles were usually ob tained froEi a aasB spectrograph^ This activity is apparently identical v^ith the previously reported(16), whose beta ray has this saae energy and whose half-life has been reported to be 60 hours. The strontium fraction from \?hich this yttrium was separated showed a growth of activity which was equal to the decay of the daughter yttriua.…”

“…lach reprecipitation after the first one reduced the strontium in the precipitate by a factor of four to five. IdentifioatioB of in Fission Product Material and the Discovery and Identification of Sr .In connection with the work on the isolation of barium and strontium activities from fission product material, the activities of several samples of strontium were measured for a number of months to check the 55'day half-life(16), the longest reported previous to this work. It was observed that samples six to seven months old showed half-lives longer than 55 days, and a new or foreign activity was suspected.…”

Η Επίδραση Της Τεχνολογικής Προόδου Στη Δραστηριότητα Της Διαγνωστικής Πυρηνικής Ιατρικής

“…Τό 1937 βρέθηκαν ισότοπα τοϋ στρόντιου (Sr -85, Sr -89) καί τό F -18, τοϋ οποίου ή ε κλεκτική συγκέντρωση στό σκελετό των πει ραματόζωων διαπιστώθηκε τό 1941. (Stewart D.W., et al, 1937), (Snell Α.Η., 1937), (Volker J.F., étal., 1941).…”