بررسي لزوم استفاده از حفاظ سربي در اندازه گيري پرتوزايي مواد غذايي توسط آشكارسازهاي يدورسديم (تاليوم )

The Investigation of Lead Shield Application in Food Samples Spectrometry by NaI (TI) Detectors

The measurement of food radiation, as one of the most important parameters in food consumption safety, is performed according to current regulations and standard tests in most countries including Iran. Due to the presence of low-level radiation in Pod samples ,for gamma-ray spectroscopy, using lead shields. for reducing the background radiation is recommended. In this research, the influence of lead shield on Nal (TO detector background is investigated and the amount of detection efficiency and MDA (Minimum Detectable Activity) with and without lead shield is evaluated The results show that a properly designed lead shield is necessary for low-radiation measurements. The shield discussed in the present study can improve MDA value for more than 100%.