3AT7;8 I/O X T 
 
 30l«if48 
 
 MDDC - 1028 
 
 I 
 
 I 
 
 UNITED STATES 
 
 ATOMIC ENERGY COMMISSION 
 
 OAK RIDGE 
 
 TENNESSEE 
 
 184" CYCLOTRON 
 HALF -LIFE MEASUREMENTS ON DEE 
 
 by 
 Alice Dodson 
 
 Phiblished for use within the Atomic Energy Commission, Inquiries for additional copies 
 and any questions regarding reproduction by recipients of this document may be referred 
 to the Documents Distribution Subsection, Publication Section, Technical Information 
 Branch, Atomic Energy Commission, P. O. Box E, Oak Ridge, Tennessee. 
 
 Inasmuch as a declassified document may differ materially from the original classified 
 document by reason of deletions necessary to accomplish declassification, this copy does 
 not constitute authority for declassification of classified copies of a similar document 
 which may bear the same title and authors. 
 
 Date of Manuscript: March 11, 1947 
 Document Declassified: June 24, 1947 
 This document consists of 2 pages. 
 
MDDC - 1028 
 
 184 CYCLOTRON 
 HALF -LIFE MEASUREMENTS ON DEE 
 
 By Alice Dodson 
 
 Experiment done by: W, Stephan, W. Chupp, W. Grimshaw, A. Reyenga, F. Yeater, 
 A. Oliver, R. Dufour, J. Vale, R. Watt, and L. Houser 
 
 INTRODUCTION 
 
 These experiments were performed to determine the half -life of the active portion of 
 the Dee. 
 
 EXPERIMENTAL SETUP 
 
 Curve Number 1 measurements were made on Zeus ML 41345 on February 10 and 11, 
 1947. Curve Number 2 measurements were made on Zeus ML 41394 on February 18, 1947. 
 Measurements were started about 7 hours after operation ceased. See sketch for location 
 of Zeus (Figure 1). 
 
 RESULTS 
 
 The half -life of this material is approximately 7 hours. (See graph.) 
 
 6. 
 
 ZEUS METER 
 
 Figure 1 
 
- 2 - 
 Half-Life Measurements on D©e 
 
 MDDC - 1028 
 
 10 
 9 
 
 8 
 
 O 
 2 
 
 Q 
 a 
 
 CO 
 
 W 
 N 
 
 Curve* 2 
 
 Half Life 7 Hrs. 
 
 Curve # 1 
 
 Half Life 6 3/4 Hrs. 
 
 
 
 
 
 9 12 
 
 Hours 
 
 15 18 
 
 Figure 2 
 
 21 
 
UNIVERSITY OF FLORIDA 
 
 3 1262 08909 7777