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Fly ash is used in mortar or concrete compositions at an amount of cement/ fly ash weight ratio of 20.5 when the pH of 20% coal ash slurry is >ll.O, cement/fly ash wt. ratio of ~0.7 when the pH of 20% coal ash slurry is ~9.0 but *l.O when the pH of 20% coal ash slurry is >h.O but ~9.0. ## 98199337 N
Radium Protection.--The rapid increase in the use of radium during the last few years, resulting in the acquirement of large amounts of radium by various institutions, has brought with it the need for better safeguards and rules to protect the users from the radiation. The dangers arising from expos
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