Best Theratronics Ltd. is a Canadian company that manufactures and markets 2 x-ray blood irradiators - the Raycell Mk1 and the Raycell Mk2. Both units have a self-contained cooling system and can irradiate to the 25 Gy central dose in 5 and 2 minutes, respectively. In addition, both units have barcode reading capabilities, LIMS connectivity and syringe holders. A free box of 200 RadTag blood irradiation indicators is included with every new Raycell.