(1) www.physicsinstruments.co.uk/Index_RT_dosimetry.htm

(2) www.imagingequipment.co.uk/phantoms.htm

(3) www.qados.co.uk/iba_dosimetry.htm

(4) www.qados.co.uk/thermo.htm

(5) www.qados.co.uk/gammexrmi.htm

(6) www.seedos.com