Excellent for marking various substrates that are to be radiographed with run numbers, dates and exposure times,x-ray film alignment markings, etc. They incorporate a non-toxic phosphorescent material that will not leak or dry out, have no bladders or vials, and no liquid to spill. Bright green markings are visible under normal conditions, do not glow in the dark, but will show up on X-ray film. The spectral peak is 5600 Angstroms. The non-radioactive energy emitted may be adjusted by exposure to normal incandescent or fluorescent white-light. The pen is 4.5” long with a pocket clip. A screw knob advances the writing tip, which retracts by reversing the screw knob and depressing the tip.

With a higher signal emission strength and slightly longer duration of signal emission time than the Normal Energy Level Marker, the High Energy Level Marker works well when film responsiveness is lowered as with chilled films, which often require autoradiography intensifying screen techniques. The mark emits no Beta or other isotope emission, only visible light. Therefore, the use of an intensifying screen will not occur as a variable in the X-ray marking procedure.

Order#	Description	Qty	Price
F13350-0	Normal Energy Level Marker	1	$60.00
F13351-0	High Energy Level Marker	1	$62.50