Abstract. The effect of chemical quenching on the pulse height spectrum and E_max of Strontium ⁹⁰Sr were studied using the organic scintillation cocktail and observing change in florescent yield and spectral shape (energy spectrum) of beta particles of ⁹⁰Sr isotope in determining a relationship between the magnitude of material that causes quenching and the position of energy spectrum and E_max, adding 3M nitric acid (HNO₃) as chemical quencher to the scintillation, and added aqueous soluble yellow food dye with different concentration as color quencher. The beta detection efficiency depends on energy, spectral shape and cocktail. Typically, beta particles with maximum energies (E_max> 0.250 MeV are detected with > 90% counting efficiency in organic liquid scintillation, where ⁹⁰Sr has maximum beta energy, E_max, of 0.546 MeV and half-life of 28.17 years. The results were compared with reference and literature values.

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