Etching behavior of the CR-39 plastic track detector hve been studied. From bulk etch rate as well as from track etch rate, the sensitive equilibrium of this detector in NaOH solutions is examined in detail. A comparison of discrimination properties between NaOH and KOH is made .

لقد تم دراسة سلوك القشط الكيمياوي لكشف الاثر النووي CR-39 باستخدام محلول القشط NaOH و KOH مع تشخيص الحساسية المتوازنة للكشف باستخدام نفس المحلولين من معرفة معدل الحفر العام VB و معدل حفر الاثر VT ,كما تمت المقارنة بين المميزات التي حصلت للكاشف باستخدام محلولي القشط NaOH وKOH.

CR-39 --- Alpha Particles --- Normality --- physical parameters --- Comparison

The aim of this work is to study different parameters of bottled drinking water that affect the health of people of Baghdad city. To perform this target, seventeen bottled samples were collected from local markets which were different bottles size and trade markets. The samples were analyzed physical, chemical and biological factors that influence water quality of the bottled water. The physical and chemical tests of bottled water showed that the mean value of pH ranged from 6.96-8.5, Total Dissolved Solids (TDS) 8-166 ppm, Total Hardness (TH) 22-178 ppm, Calcium (Ca++) 0.0-35 ppm, Magnesium (Mg++) 0.0-30 ppm, Chloride (Cl) 0.0-27 ppm, sodium (Na+) 0.0-25 ppm, potassium (K+) 0.0-4.5 ppm, Electrical Conductivity (Ec) 16-332 µs/cm. All samples were within the permissible limits for Iraqi criteria and standards for bottled water. The biological parameters include: total plate count, total coliform, fecal coliform, E.coli and yeast& fungi. The failure percentages of samples were 23.5, 11.7, 11.7, 11.7 and 11.7% respectively.

bottled drinking water --- physical parameters --- chemical parameters biological parameters --- national Iraqi standard.