CONTENTS Abstract .........0...cceeseesceeee eens bee eee eee ence ease ete e ee rete etnd ea bce bene eeneeen ees Problem Status.............cccc cece cece cate ceases eee ee cere tas ee decreases eeeet eden nea eetees 1 1 AUthOTIZation .......... cece cece eerste teen e ee ee ncn en sree es eeneneeneeeseeeseeeeneeeenes 1 INTRODUCTION.... 0. .cceccececce cere cer ee cee ene ee teen ee een ena es eea ee enenaena renee THEORETICAL CONSIDERATIONS ..... 0. tec eee enna tere neaes EXPERIMENTAL PROCEDURE. ........... 00.0000 cc cece cece ee cece eee eens nese ees ] l 3 Air Sampling ...... 0... cece ener eee ener e acerca sete reece ree td teeta teeta Radioactivity Measurements................2. 2c cece eee ee cececeenee en teeenteen eens Atmospheric Sampling ...........cccscccseesecneneeneeeseeetereeeaeeestaeeneeeneene 3 3 6 Chamber Studies...........ccccscecerecees cere seas reset enteeeevea sees ea eeseseeeeerees 6 RESULTS AND DISCUSSION........0.. ccc ce cece reece ee ec eeeeeeeenenenenaes 6 CONCLUSIONS..... 0. cccccccecec cere ene n teen sees ee eet ease sa ebecee eens tesa eneeneaes 13 ACKNOWLEDGMENT.ou... eee ce cece cece cece eset c eee eseeeeenenaeeeeenernergers 13 REFERENCES. ........cccccececcc cece cece eet e ees ccee ae eeeteeneeneasseseenenegeneesatees 13 APPENDIX — Changes in p During Nonequilibrium Conditions.......... 14