Micro-collimator fabricated by alpha-particle irradiation of polyallyldiglycol carbonate polymer film and subsequent chemical etching

✍ Scribed by V.W.Y Choi; E.H.W. Yum; K.N. Yu

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 516 KB
• Volume: 619
• Category: Article
• ISSN: 0168-9002
• DOI: 10.1016/j.nima.2009.10.120

✦ Synopsis

In the present paper, we propose a method to fabricate a ''micro-collimator'' with a thickness of 15 mm. A commercially available PADC film with a thickness of 100 mm was first chemically etched with NaOH/ethanol solution to obtain a thin PADC film. This thin PADC film was then irradiated by 5 MeV a particles through a ''macro-collimator'' with a thickness of 5 mm and a hole diameter of 1 mm. This PADC film with latent tracks was then further etched in aqueous NaOH solution to form the micro-collimator with a thickness of 15 mm and etched-through air channels were all confined to a circular area with 1 mm diameter. Verifications were performed by checking the etched a-particle tracks formed on a test PADC film from a particles having traveled through a 20 mm support substrate attached to the 15 mm microcollimator (both substrate and micro-collimator also made of PADC). The results are discussed.