JBASV8N2A38- Gamma Dosimetric Response of Sandalfix Golden Yellow CRL Dye Solutions for Gamma Dosimetry Using Cs137 in the Range 0-1KGy

Journal of Basic and Applied Sciences - Volume 8 Number 2

Gamma Dosimetric Response of Sandalfix Golden Yellow CRL Dye Solutions for Gamma Dosimetry Using Cs¹³⁷ in the Range 0-1KGy

Muhammad Yousuf Hussain, Taqmeem Hussain, Irfan Toqeer, Nasim Akhtar, Inam-ul-Haq and Hashim Farooq

http://dx.doi.org/10.6000/1927-5129.2012.08.02.38

Abstract: The effect of gamma radiation source (Cs¹³⁷) on the aqueous solutions of the Sandalfix Golden Yellow CRL dye was determined in the range 0-1kGy. λ_max of the dye was determined by UV/VIS spectrophotometer before the exposure of gamma radiations and was found to be 422 nm. Absorbance of the sample solutions was studied at λ_max of the dye at pre and post irradiation. It was determined that the Absorbance of the sample solutions was decreased with increasing absorbed dose. The exposed dye solutions were found to be discolored due to the structural changes in the dye solutions and the discoloration of the dye was found linear with respect to absorbed dose.

Keywords: Sandalfix Golden Yellow CRL, dosimetry, Cs¹³⁷ gamma source, 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.