\documentclass{article}
\usepackage{pstricks,multido}
\usepackage[latin1]{inputenc}\usepackage[a4paper]{geometry}
\pagestyle{empty}
\begin{document}
\sffamily
\psset{unit=1.3, dimen=middle}
\SpecialCoor
\begin{pspicture}(-6,-1)(6,6)
\pswedge{5}{0}{360}
\multido{\n=1+1}{359}{\psline[linewidth=.25\pslinewidth](4.8;\n)(5;\n)}
\multido{\n=5+10}{35}{\psline[linewidth=.5\pslinewidth](4.6;\n)(5;\n)}
\multido{\n=10+10}{35}{ \psline[linewidth=.4pt, linecolor=gray](0;\n)(5;\n)
\rput*{U}(4;\n){\n}
}
\end{pspicture}
\end{document}