Granite Radiological hazards Dose parameters a b s t r a c t Gamma ray spectra of natural radioactivity from 238 U-and 232 Th series and from 40 K of eight (representing 40 collected samples) granite samples collected from Saint Katherine region, South Sinai, Egypt, had been measured using a gamma-ray spectrometer with an HPGe detector. The results reported in the present article include: Specific activities (A) of 226 Ra, 232 Th and 40 K radionuclides, Radium equivalent activities (Ra eq ), external and internal hazard indices (H ext , H int ), external and internal level indices (I g , I a ), activity utilization index (I), exposure rate (ER) and other important parameters to the subject. The results have been presented in table graphs with the permissible maximum limits.

The differential cross-section for the elastic scattering of He4 particles on Be9 has been studied in the bombarding energy range 1.4-2.5 MeV.The excitation functions for the elastically smttered a-particles from BeQ were measured a t six angles 90". 125", 132", 140", 160" and 160" in the centre of mass system. A clear and pronounced resonance is observed in the measured cross-section a t incident a-particle energy 1.93 MeV. Analysis of the data in terms of the single level approximation 5' theory leads to the assignment J" =for the observed resonance. Reduced and partial 2 widths for elastic scattering were determined.

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