Volatile distributions

AP is a low-volatile (distribution ratio of 0.7), safer alternative to hydrazine. It is relatively new on the market and was introduced by Kurita Water Industries Ltd. of Japan. 

There are two size ranges of the over-all population in which isotopic composition does not vary with particle size. Particles greater than about 200/x in diameter exhibit the uniform composition of the local fallout particles. Particles less than 2/x in diameter exhibit a constant isotopic composition which consists of a mixture of the surface deposited volatile species. The parameters of the functions which describe the mass, refractory, and volatile distributions are given in Table VI. As in the... 

There is nothing new in principle about the use of isotopes as an aid to chemistry. For twenty years the radioactive elements have been used as indicators to study adsorption, solubility, volatility, distribution, and other phenomena of physical chemistry. Distribution of heavy radioactive atoms in plants has been studied through the relative amount of ionization found in the different parts. The ionization theory was supported by dissolving radioactive lead chloride in an aqueous solution of ordinary lead nitrate and then crystallizing out the lead chloride. The radioactive lead was found to be equally distributed between the two salts. In aqueous solution the two different kinds of lead are free to exchange anions, as predicted from the electrolytic dissociation theory. With un-ionized compounds of lead it was found that exchange does not take place. 

---