تقنية لقياس السمك و العدد الذري للمعادن النقية بمقارنة قمة الاستطارة الخلفية لطيف المصدر المشع الكوبلت-60

الملخص EN

A modern method to measure thickness and atomic number for certain material by observing changes that in compared with the value of backscattering peak which rise in gamma ray spectrum of Co-60 source , used scintillation detector NaI(Tl) .

Spectrums of energy had been recorded for scattering materials (Al ,Fe ,Cu) at (0) angle between the detector & radioactive source in addition to scattering materials at ( ) angle from backscattering of photons , where kinetic energy for recall electron maximum value is leave & scattering energy of photons minimum equal to 0.2555 Mev .

Where find increase backscattering peak area cleanly in state used scattering material with state without it used & for all used thickness & increase value different with used thickness , Where two area ratio (backscattering factor) of (1)mm thickness & without used material is (110%) as two area ratio for (4mm) thickness & without used material is with value (122.1%).

And find change the atomic number of material about (26-29) by value (111.5)% changing backscattering peak area from (199314) to (215396) by value (108.06)% .

And changing backscattering factor (Fb) value from (122.1)% to (132)% .

Express increase of backscattering peak area at increase material thickness & atom number that see increase of photons number enter to the detector & this increase incoming from photons are emitted in the opposite direction of detector that scattering at ( ) angle with direction incident photon & observing this increased in backscattering region where see coincident two spectrums parts that we studies .