The method depends on a response function that is calculated by PHITS code and fitted to the beta-ray spectrum measured with a Si-detector. 
PHITS
The method depends on a response function that is calculated by PHITS code and fitted to the beta-ray spectrum measured with a Si-detector. 
Si-detector
The 134+137Cs radioactivity in the Cs-HPs was consistent with that measured by a Ge-detector, thus confirming the reliability of the method. 
Ge-detector