For more precise evaluation of the skyshine dose, the following factors are to be considered the dose rate distribution on the roof above the source and the attenuation of gamma-rays by air. The calculated values of the skyshine dose were higher than the measured values. Calculation was carried out with simplified single scattering method. Distances of measuring points from the cobalt source were in the range from 17 m to about 100 m in the site of our office. As the first step, the results of measurements and calculations were compared of the skyshine dose due to gamma-rays from the cobalt- 60 source of 1.45 PBq set in the No.4 irradiation room of our laboratory. We attempted to evaluate skyshine dose due to gamma-rays from a cobalt- 60 irradiation facility. Kanazawa, Tamotsu Okamoto, Shinichi Ohnishi, Tokuhiro Tsujii, Yukio The conventional hydrolyzation and analytical techniques used in the present study to measure meta- and ortho-tyrosine may provide the basis for a method to detect and determine the dose used in food irradiationĮvaluation of skyshine dose due to gamma-rays from a cobalt- 60 irradiation facility The occurrence of meta- and ortho-tyrosine, which had formerly been considered unique radiolytic products, has not previously been reported in nonirradiated shrimp or BSA. The measured yields of tyrosine isomers were approximately linear as a function of absorbed dose in shrimp, and in irradiated solutions of phenylalanine up to 37.0 kGy. Para-, meta-, and ortho-tyrosine was measured using HPLC in conjunction with uv-absorption detection in dilute aqueous solutions of phenylalanine irradiated in the absorbed dose range 16.0 to 195.0 kGy. Ortho-tyrosine was measured in nonirradiated BSA. Meta- and ortho-tyrosine were measured using high performance liquid chromatography (HPLC) in conjunction with electrochemical detection in shrimp irradiated using cobalt- 60 gamma radiation in the absorbed dose range 0.8 to 6.0 kGy, in nonirradiated shrimp, and in bovine serum albumin (BSA) irradiated in dilute aqueous solution at 25.0 kGy. In general, these represent about 2-10% of the wholesale cost of these products Using these figures, costs of irradiation of nine types of food products are presented. Five different types of AECL-RCC irradiation equipment are examined in terms of their throughputs, and capital and operating costs. However, since irradiation of food is relatively new from the commercial point of view, it is important to assess costs of gamma irradiation in the context of food processing. Gamma processing by cobalt- 60 is well established. Stressed in the paper is the need to work togetherĮconomics of gamma processing in cobalt- 60 irradiation facilities ![]() Finally presented are the challenges and opportunities for the industry. Highlighted are industry trends for North America, Europe and the rest of the world. Discussed is cobalt 60 usage at the customer site more specifically maintaining source integrity, source utilization and irradiator design trends. Briefly presented are the tasks associated with the safe transport of cobalt 60 around the world. Topics covered include our investment for the future supply of raw materials and the latest news from source production. Also presented are some of the many initiatives undertaken at MDS Nordion. This paper discusses the current status, trends and insights into the continued, safe use of cobalt 60 gamma irradiation. International Nuclear Information System (INIS) Cobalt 60 gamma irradiation current status, trends and insights
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