leached off the sand in the static tests, and about 3.8 percent of the 

 activity had abraded away from the sand in the abrasion study. 



Study No. 2 - Surf Mo. 2, MLLW Sand - In this study, the Point Con- 

 ception sand was treated with dilute hydrocholric acid (HCl) prior to 

 the tagging with Ba-La-lUO activity. The purpose of the HCl leach was 

 to remove sea shells and other carbonate minerals from the sand. The 

 HCl was added in small portions to the sand (which was covered with water) 

 until gas evolution ceased. The sand was washed thoroughly with distilled 

 water, and then dried before initiation of the tagging procedure. The 

 mass-size and activity-size distributions of the sample during the various 

 stages of the study are given in Table A-III. The HCl leaching and the 

 firing losses are also given. The table includes the mass-size distribu- 

 tion of the original sand sample, of the sample after the HCl treatment, 

 and of the sample after it had been tagged, coated, and fired at 1900°F. 

 Also included are the distribution of the activity on the tagged sample 

 and the mass-size distribution of the sand at the termination of the 

 abrasion studies. Leaching and abrasion data were collected for 12 days. 

 The results for the leaching experiment showed that 1.1 percent of the 

 activity was lost to the aqueous phase. For the abrasion experiment the 

 figure was k.2 percent. 



Study ho. 3 - Surf Ho. 2, MLLW Sand - This study was terminated by 

 an accident early in the course of the experiment. The experiment was 

 repeated as Study No. k. 



Study Ho. k - Surf Ho. 2, MLLW Sand - The purpose of this study was 

 to determine the effect of the carbonate minerals in the Point Conception 

 sand on the sealing of the tagged sand. Therefore, the carbonates were 

 not removed by the preliminary HCl leach. The high temperature at which 

 the water glass is fired decomposes the carbonate minerals. As in the 

 previous study, the mass-size and activity-size distributions at various 

 stages of the study are given in Table A-IV . After 12 days of static 

 leaching, h.Q percent of the activity was in the aqueous phase. The 

 comparable value for the abrasion experiment was 15.8 percent. These re- 

 sults clearly indicate that the presence of carbonate mineral decomposition 

 products (basic oxides) in the sand adversely affects the sealing quality 

 of the water-glass tagging procedure. 



Study Ho. 5 - Bear Creek Ho. 1, +5 Sand - This study was made to 

 check the water-glass procedure with one other Point Conception sand. This 

 particular sand was selected because of its fine, uniform appearance. The 

 carbonates were removed before the sand was tagged with Ba-La-l40 activity. 

 The size and activity data are given in Table A-V. After 12 days of static 

 leaching, approximately 0.6 percent of the radioactivity had escaped into 

 the aqueous phase. For the abrasion experiment, 0.9 percent of the 

 radioactivity was in the aqueous phase. 



Study Ho. 6 - Monterey Sand - This study was made to determine whether 

 Revlon nail enamel, Ho. 6l, had adequate sealing properties for retaining 

 radioactivity under the conditions described in the previous studies. 



A-6 



