Prediction of Liquid Density by Gamma-Ray Measurement for Materials with Low Atomic Number
- PDF / 785,091 Bytes
- 7 Pages / 595.276 x 790.866 pts Page_size
- 67 Downloads / 153 Views
ORIGINAL PAPER
Prediction of Liquid Density by Gamma-Ray Measurement for Materials with Low Atomic Number S. M. Golgoun1 , D. Sardari1* , M. Sadeghi2 and F. Babapour Mofrad1 1
Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, P.O. Box 14515-775, Tehran, Iran
2
Medical Physics Department, School of Medicine, Iran University of Medical Sciences, P.O. Box 14155-6183, Tehran, Iran Received: 24 May 2019 / Accepted: 19 April 2020 Ó Metrology Society of India 2020
Abstract: A new method has been developed and evaluated for density measurement of liquid materials based on conventional gamma density meter, whether a low strength gamma radioactive source as the backscatter technique with collimated detector cannot be properly used for density measurement. In this comparative study, proposed method aimed to improve the linearity of the density measurement without using time consuming spectroscopy. Both transmission and backscatter methods for density measurement were used together in a combined model. The whole measurement system was designed, constructed and simulated for nuclear gamma–gamma density measurement. MCNP modeling results were benchmarked with experimental data, showing a good correlation between combined density measurement method and conventional transmission density measurement while values of MRE(%), RMSE and MAE(%) are lower in combined model. This study shows that, MRE(%) in combined model, and for both experimental and simulation results, is improved with the average of about 41% in comparison with the conventional density measurement. Also in this comparative study, RMSE decreased significantly about 56%. Additionally, average MAE (%) reduced about 36%. Furthermore, R-square values were also improved in both experimental and simulation results. Evaluating different methods of nuclear density measurements led us to propose an innovative formula, to investigate an accurate density measurement. This paper discusses advantages of proposed model in comparison with the conventional transmission method for gamma interaction with lower percentage errors and better calibration curve fitting. Keywords: Density; MCNP code; Transmission technique; Error reduction; R-square 1. Introduction A nuclear measurement device can quantify, monitor and control process materials online (in severe working conditions [1]. Radiometric density instrument is one of the non-destructive tools used in various industries to measure the density of the process materials in a pipe, vessel or tank. It has several advantages, providing a fast, precise, contactless and online continuous measurement [2, 3]). Transmission and backscatter methods are mainly used for measuring the density of materials [4, 5]. Also in some cases, spectroscopy is used to improve density measurement results [6]. For measurement of dose [7], density,
*Corresponding author, E-mail: [email protected]
thickness, porosity, etc. by the help of nuclear techniques; spectroscopy, Geant4 simulation, Monte Carlo N-Part
Data Loading...
