Summary Statistics for Homemade 'Play Dough' Data Acquired at LLNL.

Kallman, J. S. ; Morales, K. E. ; Whipple, R. E. ; Huber, R. D. ; Martz, A. ; Brown, W. D. ; Smith, J. A. ; Schneberk, D. J. ; Martz, H. E. ; White, W. T.

Technical Information Center Oak Ridge Tennessee

关键词: Computerized tomography;    Attenuation;    Statistical data;    Chemical composition;    Atomic number;   

RP-ID  :  DE2010973860

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Using x-ray computerized tomography (CT), we have characterized the x-ray linear attenuation coefficients (LAC) of a homemade Play Dough(trademark)-like material, designated as PDA. Table 1 gives the first-order statistics for each of four CT measurements, estimated with a Gaussian kernel density estimator (KDE) analysis. The mean values of the LAC range from a high of about 2700 LMHU(sub D) 100kVp to a low of about 1200 LMHUD at 300kVp. The standard deviation of each measurement is around 10% to 15% of the mean. The entropy covers the range from 6.0 to 7.4. Ordinarily, we would model the LAC of the material and compare the modeled values to the measured values. In this case, however, we did not have the detailed chemical composition of the material and therefore did not model the LAC. Using a method recently proposed by Lawrence Livermore National Laboratory (LLNL), we estimate the value of the effective atomic number, Z(sub eff), to be near 10. LLNL prepared about 50mL of the homemade 'Play Dough' in a polypropylene vial and firmly compressed it immediately prior to the x-ray measurements. We used the computer program IMGREC to reconstruct the CT images. The values of the key parameters used in the data capture and image reconstruction are given in this report.