Absolute measurement of (198)Au activity in gold foil using plastic scintillators and a well-type NaI(Tl) detector

Yun Ho Kim; Jungho Kim; Jong-Man Lee; Hyeonseo Park

doi:10.1016/j.apradiso.2015.12.012

Absolute measurement of (198)Au activity in gold foil using plastic scintillators and a well-type NaI(Tl) detector

Appl Radiat Isot. 2016 Mar:109:382-385. doi: 10.1016/j.apradiso.2015.12.012. Epub 2015 Dec 5.

Authors

Yun Ho Kim¹, Jungho Kim², Jong-Man Lee², Hyeonseo Park³

Affiliations

¹ Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea; Department of Nuclear Engineering, Hanyang University, Seoul 133-791, Republic of Korea.
² Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea.
³ Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea. Electronic address: hyeonseo@kriss.re.kr.

PMID: 26678344
DOI: 10.1016/j.apradiso.2015.12.012

Abstract

A beta-gamma coincidence system has been developed for measuring (198)Au activity in gold foils. The system was validated by Monte Carlo simulations and by measuring the activity of a (60)Co point-source. To study effects such as self-shielding of beta particles in gold foils, (198)Au activity measurements and simulations were performed for various scintillators and foil sizes. The measured (198)Au activities were ~1% above the reference activity, which might be due to self-shielding of beta particles. The measured and simulated (198)Au activities agreed, suggesting feasibility of precise activity measurement.

Keywords: (198)Au; Beta–gamma coincidence counting; Geant4; Thermal neutron field.