Sievert integral
# Sievert integral

The Sievert integral, named after Swedish medical physicist Rolf Sievert, is a special function commonly encountered in radiation transport calculations.

It plays a role in the sievert (symbol: Sv) unit of ionizing radiation dose in the International System of Units (SI).

## Definition

    $F(x,\theta )=\int _{0}^{\theta }{e^{-x\sec(\varphi )}}\,d{\varphi }.$
