A proposal to design a new high volume standard air filter for efficiency calibration of HPGe detector

摘要

A prototype of a standard high volume air filter was proposed and constructed by a novel method, which provides a symmetric distribution of radionuclides for accurate measurements of radioactivity in air samples. Then air samples were collected at an air flow rate of 300 m(3) h(-1) to 900 m(3) h(-1) samplers for 24 h per sample. The average concentrations of Be-7 and Pb-210 were measured as 3.80 +/- 0.46 mBq m(-3) and 0.92 +/- 0.33 mBq m(-3), respectively. The data can be used as a basis for related measurements in the atmospheric pollution research in Iran.