Abstracts--1 lth ICSSNTD 409

the data obtained to date the authors summar i ze sys temat i ca l ly the i r in te rpre ta t ion p rocedu re s in which is s t r e s s e d the p roper use of obse rved double peaks of an anomaly, the i r depth and t ime gradients for locating ore bodies , and for se lec t ing favourable anomal ies for a t tempt ing to de te rmine the ore body depth.

A NEW TRACK ETCHANT FOR PLASTIC DETECTORS

Teha[ Singh, Sur inder Singh and H.S. Virk

Depar tment of Phys ics , Guru Nanak Dev Univers i ty , A m r i t s a r , (India)

ABSTRACT

Aqueous solutions of NaOH and KOH are commonly used as t rack etchants in p las t ics in all l abora to r i e s engaged in SSNTD work. Somogyi et al. sugges ted PEW solution (15 g KOH + 40 gin. C2H5OH + 45 g H20 ) and addition of KMnO 4 to alkaline solut ions.

Hydroxides of alkali me ta l s have been tes ted for the i r e tching eff ic iency by var ious au thors .

CN and Lexan plast ic were i r rad ia ted with Cf-252 source . Aqueous solution of Ba (OH)2 8H20 was used for etching f i ss ion f ragment t racks in p las t i c s . It is obse rved

that this new etchant is as eff icient as NaOH and KOH for t rack revela t ion .