Radiochemical technique for determining depth distributions in Mo

Molybdenum can be anodized at up to 235V in an electrolyte containing glacial acetic acid, , and water. The resulting oxide films, which must be stabilized by compressed‐air drying, show brilliant interference colors, have a linear (or nearly linear) thickness‐voltage relation, and can be formed with thicknesses of up to 380 µg/cm2 of oxide (∼8400Aå). When exposed to 1.0 g/liter aqueous , the films dissolve ("strip") within 30 sec, whereas the underlying metal dissolves at a rate of only 20 Aå/hr. The film thicknesses formed on Mo which has been subjected to Kr ion bombardment at doses of up to are similar to those on unbombarded specimens. It follows from these results that the use of an anodizing‐stripping sequence for determining depth distributions in Mo should be possible. Examples of depth distributions for 10‐keV Kr implanted at doses from are given and are shown, by comparison both with theory and with previously obtained results for W, to be numerically plausible.