Report, January 25, 1926

A Fow to be Kept in ind in Compliering time PUBLICITY Effnots CL Radium and on the mum 1. are yo 250 is paid as callum one conse- in its puro itte, zeight fur wei ,Ist, the notivity sould grently excesd that of ralium. However, use of neso- toorium is not expressed in by Deight, but 1t is ented in teras of radium, thus the notivity of uiro compounda compared Dene the ande ratio as the values nesigned to the propinations. 2. Althoa neso are U 15 rayless, its first product, is repirtly formed nfter hrs been separated, powarful and are radiations. 111 the production of nesothoriui the operntor nuat protect nghinst these penstrating milition. Inlu 13 not so nece. sayin the production of millu 33 the product giving so the penetrating militation c) 13 formed esther loo 3. The hall volue perion of raliun is 2520 yenra alle.thnt, of Leacthorium 10 6.7 yours. Zais 1. of 1-potance in conalder- in the accuration sivo affects of 672 may be deposited in the 4. In the deeny o2 mallus sa have the clost product the 15th = peniod of 3.3 by the sotive deposit of must uninge (Ra), RaJ, Rac), who onen the active de cosit of 6107 CRAD, R=I, inf). Pridium D and 14 anit sort bets page in nove are periola of 16.5 enra and 4.85 reapectively. tillus F on Polonius e I's slohn age and nas a attic period of 136.5 In the casa of the an st allif partod of 54.5 ascondo, with 10 followed Th Ap is, is C, to the setive response of capid change in the padius peries. ThC is followed by Thorium D (Th lend) nion is JT blo It 1a inportint to note, thri while thers 1. , from Rnion 8 product of compre bively tong life autour rad- intuon two is no product generated in the thorius series. 5.The are mase of an sipas pirticle Crca the is rium series is 5.6 on, mile fro.: the millin series it 23 6.04 cm. H. H. Birker. Physical Labgentory, January 5. 1936