In detail, the mass attenuation coefficient ([mu]/[rho]) from (2) was calculated as shown in Figure 6.

Mass Attenuation Coefficient and Exposure Buildup Factor.

Shinji et al., "Measurements of photon

mass attenuation coefficients for Ge and BGO crystals at 10 Me V," Journal of Nuclear Science and Technology, vol.

As described in the introduction, the DECT is able to provide a detailed material images according to a

mass attenuation coefficient of a specific material, which its atomic number (Z) is playing a rule as well.

The present study has been undertaken to obtain information on the total

mass attenuation coefficient ([[mu].sub.t]) values and atomic, molecular, and electronic effective cross sections for nonessential amino acids.

The soil

mass attenuation coefficients determined herein depict only one measurement for each soil type sampled.

The

mass attenuation coefficients ([mu]) of the radiation sources were calibrated based on comparing the average final vertical density profile result from the Quintek[TM] x-ray vertical density profiler, and from measuring the unheated pressing of resinless mats of various MCs.

(2002) investigated the effect of wood chemical composition on

mass attenuation coefficients. After studying the ratios 50/25/25, 25/25/50, and 10/10/80 for cellulose/hemicellulose/lignin, Lindgren (1991) found that the average value of the

mass attenuation coefficient was 0.0876 [cm.sup.-1] with a 0.4 percent coefficient of variation (COV).

Therefore, we have calculated the

mass attenuation coefficients, [mu]/[rho], half-value layer, HVL, tenth-value layer, TVL, effective atomic numbers, [Z.sub.PIeff], and effective electron densities, [N.sub.e, eff], of borate glass samples containing PbO and NiO given in Table 1.

The

mass attenuation coefficients for soil and water were 0.244294 [+ or -] 0.00250 and 0.19890 [+ or -] 0.00018 [cm.sup.2]/g, respectively, for the 59.54 keV photons, which agree with values found in the literature for 241 Am source (Ferraz and Mansell 1979).

Hubbell, Tables and Graphs of Photon

Mass Attenuation Coefficients and Mass Energy-Absorption Coefficients for Photon Energies 1 keV to 20 MeV for Elements Z = 1 to 92 and Some Dosimetric Materials, Publication of the Japanese Society of Radiological Technology, ISSN 1340-7716 (1995); also as J.

The magnitude of the air attenuation correction is in general agreement with corrections for x rays in the same energy region but is greater than the value calculated using

mass attenuation coefficients (3) weighted for the source spectrum.