def __init__(self,inp='INP.mcnp'):
        """ Wrapped Cylinder MCNPX Model of RPM8

        Keywords:
        inp -- desired name of the input deck
        """
        # Material dictionary for the moderator, light guide, and detector
        self.material =  {'Moderator':None,'Detector':None,'LightGuide':None}
        self.material['Detector'] = {'name':'Detector','mt': 3, 'rho': 1.1,'matString':None}       # detector
        self.material['LightGuide'] = {'name': 'PMMA','mt':10, 'rho':0.93}   # PMMA
        self.material['Moderator'] = {'name':'HDPE','mt':456, 'rho': 0.93}         # HPDE