lateral ap radiation technologist radiology radiography positioning daughter decay scheme hvl beta energy energy gamma half life iodine paladium gold iridium cesium cobalt radium radiation therapy sources therapy brachytherapy outline representation subglottic airways trachea sid grid cassette size fish bone foreign bodies hyoid bone esophagus central ray standing erect upper airways soft tissue neck xrays reverse lordotic lung infections apices fractures retrosternal spaces pneumothorax tuberculosis pleural iffusion oblique pa decubitus lordotic apicogram ctr lungs ribs sternum chest inion gonion acanthion nasion glabella vertex iml canthus ioml skull radiography views x-rays skull cranial
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