JBASV8N2A30- Dosimetric Characteristics of Aqueous Solutions of Sandalfix Red Dye for Gamma Dosimetry

Journal of Basic and Applied Sciences - Volume 8 Number 2

Dosimetric Characteristics of Aqueous Solutions of Sandalfix Red Dye for Gamma Dosimetry

Taqmeem Hussain, Muhammad Shahbaz, Inam-ul-Haq, Hashim Farooq, Nasir Amin and Yasir Jamil

http://dx.doi.org/10.6000/1927-5129.2012.08.02.30

Abstract: Gamma dosimetric behavior of the aqueous solutions of the Sandalfix Red (C.I. Reactive Red 195A) dye was studied. The sample solutions of two chemical natures i.e., Acidic and Alkaline; were irradiated by Co60 γ-source in the range 0-100kGy. The "Control samples" were kept un-irradiated and also chemically neutral. The dosimetry was done in three phases i.e., Low, Intermediate and High, ranging from 100-1000Gy, 1-10kGy and 10-100kGy respectively. The found values of the "λmax" and the molar extinction coefficient "ε" of the dye were 565nm and 0.19×104 dm3 mol-1cm-1 respectively. The absorbance (A) of the aqueous solutions was studied at the absorption band maxima (λmax). It was hence found that the aqueous solutions of the Sandalfix Red C4BLN dye were able to be used as passive dosimeters in the range 10-100 kGy i.e., the sample solutions have shown radioactive exponential behavior of response in the "Intermediate and High dosimetry". However, a linear response was shown by the sample solutions in the "Low dosimetry".

Keywords: Chemical dosimeters, Sandalfix Red C4BLN dye, dosimetry, optical density (OD), radiolytic bleaching.

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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.