Measurement apparatus comprised of power supply, liquid lightguide, PMMA, integrating sphere, double monochrometer, photomultiplier tube, voltage controller and computer for determining the sun protection factor values of samples

'apparatus':2 'compris':3 'comput':19 'control':17 'determin':21 'doubl':12 'factor':25 'integr':10 'lightguid':8 'liquid':7 'measur':1 'monochromet':13 'photomultipli':14 'pmma':9 'power':5 'protect':24 'sampl':28 'sphere':11 'sun':23 'suppli':6 'tube':15 'valu':26 'voltag':16

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