Abstract
In this paper the specific activity of 238U, 232Th and 40Kradionuclides were determined by sodium iodide enhanced bythallium NaI(Tl) detector and assessment the annual effective dosein samples of powder milk from different companies such asAlmunaish, Seven Caw, Molty and Altunsa for adult available inBaghdad markets. The specific activity of 40K has the greater value inall the samples which is in the range of allowed levels globally thatsuggested by UNSCEAR. The mean value of annual effective doseswere 0.121, 0.314775 and 0.305 mSv/y for 238U, 232Th and 40Krespectively.
Highlights
The aim of current work is measuring specific activity for 238U, 232Th and 40K in samples of powdered milk; Almunaish, Seven Caw, Molty and Altunsa in the local markets of Baghdad city in 2014 and the calculation of the annual effective dose resulting from the presence of these radioactive isotopes using a gamma spectrometry, NaI (Tl) detector, this work is necessary in the viewpoint radiation protection and the search for the presence of natural radioactive elements in food covered by the humans
Spcific Activity Bq/kg minimum value were appeared in Molty and Altunsa sample respectively
Specific activity for 226Ra, 232Th and 40K in different samples of powdered milk were measured by NaI(Tl) detector
Summary
The purpose of the measurements of radiation in food and the environment is of principal importance in the prevention of radiation in order to protect humans from contaminated food and polluted environment as a result of nuclear activities [1], and protected food and the environment and appropriate non-contaminated with radioactive materials as a result of the disposal of these materials operations both during the process of nuclear activity or after it ends [2], identification and appropriate disclosure of the existence and nature of the radioactive material in food or environmental goals to take preventive measures or appropriate treatment through knowledge paths of. The measurements of radiation in food and the environment, it is always advisable to be the amount of pollution in the food measure on the basis of measuring the amount of pollution in the different varieties of food each separately and based on the consumption pattern of these items where the process of analysis of the amount of the overview of the impact of the consumption of these types of radioactive materials, as well as to familiarity with the style of the production of these food items and the environment that produces it, and this includes familiarity with complementary operations of the production process or direct preparation before consumption [5, 6]. Techniques that used to determine NORM in milk powdered samples, gamma spectroscopy with sodium iodide (NaI(Tl)) detector which are calibrated for a period of 3600 seconds, and completely isolated by lead shield [10]
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