conc. Description Step neutrons were to come Lrom Comments supposed ail forgetfulness) direc- tions Etching 20 minutes etching at 5.94N KOH + 0.495 at 60.5%, 40 minutes etching at 5.72N KOU + Q.305 at The foils were totally immersed in 3.5 | KOU after CM reading on the foils were less than 1 mR/hr 60.3°C, SO minutes etching at 5.14N + 0.428 at 60.3°C Rinse 15-20 minutes in circu- latiny distilled water Drying 86°C oven till dry Tracks viewing ad tracks from 20 min. etching are needle Like, for 40 and 80 min. are smali and big oval-shaped length and width of the track a) and the track density have not been measured holes respectively b) tracks that have to be U or Pu Fission tracks abound on foils in direct contact with the Al foil und on the edges of the foil. c) Tmages of the tooth and the embedding material is present d) Star agpregates are present though sparse and can be Found mainly where the tooth is but is also visible where the tooth isn'é e) Needle like tracks from 40 min and 80 min etehings seem to be buried in sections where the dentine of the tooth was r) photomicrozraphs and polaroid shots of tracks on the viewing sereen were is taken 2009443 bo} though the 41 foil has a high chemical purity, U contamina- tion can easiiy come about through contact with phere, etc. c) the atmos- due to inadequate contact, images of the dentine, pulp, enamel are not distinguishable d) agpregates could be clusters of Pu in the teeth or resulting from background U-238 converSion to Pu-23%