The accurate evaluation of the absolute intensity (I%) of the gamma-ray transition 1001.03 keV of 234mPa is crucial for accurate determination of 238U in nuclear material and environmental samples. Over the last decades, a wide range of 1001.03 keV absolute intensity values were published by different researchers and ranged from 0.59 to 1.12 %. Nowadays, one of the most commonly used values is 0.847±0.008 % that seems not accurate and would eventually lead to an overestimation of 238U activity concentration.