.. _func-ThermalNeutronBk2BkExpSigma:

===========================
ThermalNeutronBk2BkExpSigma
===========================

.. index:: ThermalNeutronBk2BkExpSigma

Description
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ThermalNeutronBk2BkExpSigma is a function to calculate :math:`\sigma(d_h)` of :ref:`ThermalNeutronBk2BkExpConvPVoigt <func-ThermalNeutronBk2BkExpConvPVoigt>`.
It is defined as

.. math:: \sigma(d_h) = \left(\sigma_0^2 + \sigma_1^2 + d_h^2 + \sigma_2^2 + d_h^4\right)^{0.5}

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