Journal of Basic and Applied Sciences  -   Volume 8 Number 2

Gamma Radiation Effect on Commercial Reactive Dye in the Range 0-100KGy Using the Idea of the De-Coloration Factor and Extinction Coefficient.
Taqmeem Hussain, Muhammad Attique Khan Shahid, Muhammad Shahbaz, Inam-ul-Haq and Hashim Farooq

http://dx.doi.org/10.6000/1927-5129.2012.08.02.51

Abstract: In this study the usability of aqueous solutions of SR C4BLN and SGY CRL dyes; as secondary dosimeter was checked using the novel idea of de-coloration factor and extinction coefficient. All samples were irradiated by Co60 γ-source in the range 0-105Gy. Absorbance of solutions was noted at λmax for pre and post irradiation stages. The λmax of Red and Yellow dyes were 545nm and 448nm respectively. The absorbance%, extinction coefficient and %age of de-coloration factor for each dye were determined. The results showed a gradual decrease in Absorbance% and extinction coefficient while decrease in %age of de-coloration factor with the increase in absorbed dose which confirms the said dyes as secondary dosimeter in stable and safe mode.

Keywords: Chemical dosimeters, SR C4BLN, SGY CRL, dosimetry, Absorbance %age, extinction coefficient, de-coloration factor.

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The Effect of Grain Size on Radon Exhalation Rate in Soil Samples of Dera Ismail Khan in Pakistan

Tabassum Nasir and Nisar Ahmad

http://dx.doi.org/10.6000/1927-5129.2012.08.02.29

Abstract: Radon concentration and its exhalation rate has been measured from twenty five soil samples collected from seven different locations of Dera Ismail Khan, in the north west of Pakistan. These samples were crushed after drying and passed through sieves with different sizes of pores to get three grain sizes, £0.595 mm, 0.595-2.00 mm and 2.00-4.00 mm of soil. CR-39 based NRPB (National Radiological Protection Board) radon dosimeters have been used to measure the radon concentration and exhalation rates. The maximum average value of radon exhalation rate has found to be: (3.57±0.38) Bq m-2 hr-1 in the samples having grain size 2.00-4.00 mm and the minimum as: (2.21±0.26) Bq m-2 hr-1, in the samples with grain size £ 0.0595 mm. This indicates that the radon exhalation rate increases with the grain size. The maximum average value of radon exhalation rate has been found in samples collected from river side where soil texture is silty clay loam. The obtained values of radon exhalation rate for all the samples are well below the world average value of 57.60 Bq m-2 hr-1.

Keywords: Radon concentration, Radon exhalation rate, grain size, soil texture.

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