The Construction and Measurement of Beta-ray Applicators for Use in Ophthalmology

Dose–Effect Relationships for Recurrence of Keloid and Pterygium After Surgery and Radiotherapy

“…90 Sr treatment is performed with an ophthalmic applicator (59) and is therefore a convenient and practical radiation method and has the advantage of minimal tissue penetration. It has consistently been shown to be effective.…”

Radioactive Strontium in Ophthalmic Treatment

“…This is probably due to the fact that the action of the beta-rays emitted by SrQO is limited to the cornea, since even 3 mm. away the dose is only 12 per cent with the circular applicator and 8 per cent with the patch applicator (15,18). T h e iris and the lens, thus, receive only a total of 288 and 192 respectively when 000 to 1,150 rep (5, 19).…”

“…Sr90 is a pure beta-emitter with a half-life of 28 years (2). It has a maximal energy of 0.61 MeV and emits so superficial a radiation that the posterior surface of the cornea, at a distance of 1 mm., receives 75 per cent of the surface dose, and the lens, normally at a n average distance of 3 mm., only about 12 per cent (15,18). The radioisotope, either circular or patch-formed, is on the surface of an applicator prepared so as to conform to the bulbus.…”

Prevention of pterygium recurrence by postoperative single-dose β-irradiation: a prospective randomized clinical double-blind trial

“…Using a 90 Sr ophthalmic applicator (20) with an active diameter of 12 or 15 mm, a single dose of 2500 cGy was administered to the surface of the conjunctiva at a dose rate of between 200 and 250 cGy/min. (According to the radioactive source test report from Amersham, the calibration values of the sources on October 20, 1992 were 5.08 rads/s for the 12-mm applicator and 3.79 rads/s for the 15-mm applicator.)…”