teve/roentgen/issues/26
        def func(composition, e):
            return sum([
                MassAttenuationCoefficient(element).func(e) * frac_mass
                for element, frac_mass in composition.items()
            ])

        material_func = partial(func, fractional_masses)

        material.mass_attenuation_coefficient.func = material_func
        return material</code></pre>
</details>
<h3>Static methods</h3>
<dl>
<dt id="stixdcpy.transmission.Transmission.create_material"><code class="name