<p>Iradiator gamma, yang diberi nama iriradiator Merah Putih, telah selesai dibangun dan diisi dengan sumber Cobalt-60 dengan kapasitas sekitar 300 kCi. Dirancang untuk multiguna, iriadiator ini harus dapat menyediakan berbagai dosis serap dari rendah hingga tinggi. Sistem kontrol mengijinkan 4 opsi kombinasi rak-rak sumber dengan opsi aktivitas terkceil adalah 41,2 kCi. Di dalam bungker, produk akan menjalani mekanisme laluan iradiasi dengan tujuan agar mendapatkan dosis serap iradiasi yang beragam. Bungker menyediakan 72 posisi iradiasi. Di setiap posisi iradiasi, gerakan produk dapat dihentikan untuk jeda waktu tertentu menyesuaikan dosis serap iradiasi yang diinginkan. Waktu minimum bagi produk menyelesaikan menkanisme laluan iradiasi adalah 78,5 menit. Pengujian dosis dosimetri menunjukkan bahwa laju dosis serap opsi pengoperasiaan aktivitas sumber terkecil adalah 0,22 kGy per jam. Rasio Dmaks/Dmin bergantung pada densitas produk. Untuk densitas 0,2, 0,4, dan 0,6 g/cm3, rasio keseragaman dosis masing-masing adalah 1,54, 1,65, dan 1,71. Kombinasi karakterisasi mekanik dan dosimetri mengantarkan pada dosis serap minimum yang mungkin diperoleh sebesar 0,29 kGy. Dengan batasan minimum ini, segala tujuan iradiasi yang membutuhkan lebih besar dari dosis tersebut sangat dimungkinkan menggunakan iradiator Merah Putih seperti untuk karantina buah segar, pengawetan biji-biji serelia, buah-buahan kering, dan lain-lain. Permasalahan kapasitas produk juga menjadi bahan pertimbangan. Kapasitas produksi iradiasi bergantung berbagai parameter seperti dosis serap iradiasi yang diinginkan dan densitas produk, serta parameter operasional lainnya. Jika dibutuhkan dosis serap iradiasi Gy dan densitas produk 0,4 gr/cm3, maka kapasitas produksinya adalah 3,17 ton/jam atau 76 ton/hari. Kapasitas dapat berubah bila parameter iradiator juga berubah.</p><p> </p><p><strong>Characterisation and Potential use of Irradiator Red and White for Handling Food Product Agricultural.</strong></p><p>A gamma irrdiator called Irradiator Merah Putih, has been contructed and loaded with Cobalt-60 sources having a total activity of about 300 kCi. Designed for multipurposes, the irriditor should be able to provide low-to-high absorbed doses. The control system allows 4 options for combination of source racks with the smallest activity option is 41.2 kCi. Inside the irridiator bunker, the product to be irradiated will undergo an irridiation source pass mechanism in order to obetain uniform irradition absorbed dose. The bunker provides as many as 72 irradiation positions. At its position, the product maybe stopped for certain period of delight adjusting the desired irradition dose. The minimum time for the product to complete the source pass mechanism is 78.5 minutes. The dosimetry test showed that the absorbed dose rate for the smallest source activy operation was 0.22 kGy/hr. The Dmax/Dmin ratio depend on the product densitiy. For densities 0.2, 0.4, and 0.6 g/cm3, the dose uniformity ratios were respectively 1.54, 1.65, and 1.71. The combination of both mechanical and dosimetry characterization leads to a minimum absorbed dose of 0.29 kGy. With this minimum restriction, any irradiation objective requiring greater than that dose is posible using the irradiator Merah Putih such as for fresh fruit, quarantine, presservation of ceral grains, dried fruits,and others. The irradiator’s throughput is also considered. The irradiation capasity depends on various parameters such as the desired irradiation absorbed dose and the density of thr product as well as other operational paramters. If a 400 Gy of irradiation of absorbed dose is required for a product with the density of 0.4 g/cm3, its production capacity is about 3.17 ton/h or 76 ton/day. The capasity may change when irradiator operational parameters are also change.</p>
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