MEASUREMENT OF INTERNAL CONVERSION COEFFICIENT Of 280kev γ – RAYS IN 203Hg

The measurement of the internal conversion coefficient of 280keV γ – ray in ²⁰³HG have been investigated by means of calibrated 2ʺ x 2ʺ NaI(Tl)(scintillation detector which is sodium iodide activated with small amount of thallium) γ – rays spectrometer, using the standard γ – rays sources Co⁶⁷ and Ba¹³³ as shown in Table(1), and prepared a source of Hg²⁰³ from Hg²⁰³Cl₂. It have been used some heavy element Au¹⁹⁸ isotope Ti⁸¹[3, 6, 9, 12,13, 15].

The total internal conversion coefficient of a γ – ray may be calculated by taking the ratio of the number of detected X – ray to the γ – ray, Equation (14).

In this workit have been discussed some important γ – ray interaction processes like photoelectric effect, Compton scattering and pair production etc. through which gamma ray interact with matter and get absorbed in it[1,2,16]. The measured value of  internal conversion coefficient of 280KeV γ – ray in Hg²⁰³ at various source detector distances in centimeters (0.0, 3.2, and 4.2) which gives internal conversion coefficient (α) 0.230, 0.179 and 0.187 respectively.

The average internal conversion coefficient α, of 280 keV γ – ray in Hg²⁰³is 0.2.

By comparingthe measurement results with the standard value, it had been found that the measured values of internal coefficient of 280 KeVγ – ray in ²⁰³Hg was independent of source detector distance which was obvious and came out to be  0.20. Our experiment finding was in good agreement with the earlier reported value as 0.20.