682 



TABLE 740.— CHARACTERISTICS OF SOME HIGH-SPEED ALPHA-PARTICLES 

 FROM ARTIFICIAL RADIOACTIVE SOURCES* 



* For reference, see footnote 199, p. 61) 

 t Approximately, from curve. 



TABLE 741.— VAPOR PRESSURE OF THE RADIUM EMANATION IN cmHg 



Temperature °C —127 —101 —65 —56 —10 +17 +49 +73 +100 +104 (crit) 



Vapor pressure 9 5 76 100 500 1000 2000 3000 4500 4745 



SMITHSONIAN PHYSICAL TABLES 



