A Tracer Study with Oxygen-18 in Photosynthesis by Activation Analysis

. . . . . . . . . . . . . . . . . 3 Introduction . . . . . . . . . . . . . . . . . . . . 4 Se l ec t i ono f I so tope . . . . . . . . . . . . . . . . 5 Working Conditions . . . . . . . . . . . . . . . . . . 6 T r a n s f e r of a P a p e r Chromotogram to a Metal Sheet . . . . . 6 I r rad ia t ion Development and Identification of Radioisotopes . . . . . 8 Aluminum T a r g e t . . . . . . . . . . . . . . . . . 10 Tantalum T a r g e t . . . . . . . . . . . . . . . . . 11 Targe t Holder and Ta rge t Sheet . . . . . . . . . . . . 14 Sensit ivity . . . . . . . . . . . . . . . . . . . 1 4 P r e l i m i n a r y Photosynthetic Exper iment . . . . . . . . . . . . 16 S u m m a r y . . . . . . . . . . . . . . . . . . . . . . 18 A TRACER STUDY WITH OXYGEN-18 IN PHOTOSYNTHESIS BY ACTIVATION ANALYSIS Ingr id ~o~elstrfiine em an, Osrnund Holm-Hansen, B e r t M. Tolber t , and Melvin Calvin Radiation Labora tory and Depar tment of Chemis t ry , Univers i ty of California, Berke ley California