PRODUCTION OF IONIZING RADIATION SOURCE OF IRIDIUM-192 FOR NDT

Oct 16, 2020, 6:25 PM
25m
Online

Online

Oral report Section 3. Modern nuclear physics methods and technologies. Section 3. Modern nuclear physics methods and technologies

Speaker

U.T. Ashrapov (The Institute of Nuclear Physics of the Academy Sciences, Tashkent, Republic of Uzbekistan)

Description

Manufacturing of ionizing radiation source Ir-192 activity 50100 Ci has been begun that 20-30 pieces of disks of natural iridium (=2.7 mm, h=0.2 mm, m=31.7 mg) was placed in aluminum foil packing, then aluminum container with packaging in vertical channel of the WWR-SM reactor was irradiated by neutrons at following regime: special container EK-10 with iridium disks loading place is into core of fuel assemble type IRT-4M on distance 3045 cm from top point of fuel assemble; nominal power of reactor =10 МWt; reactor operating mode with periodic stopdowns; thermal neutrons stream density ≥0,7×1014 n/сm2sec; irradiation time ≥550 hours. Than after certain exposure aluminum packaging with disks of iridium irradiated containing Ir-192 radionuclide to special device was placed and their radiochemical processing was spent. Then iridium disks irradiated in stainless steel capsule (=4.5 mm, h=8.0 mm) was placed, by cover was closed, dot argon-arc welding was spent and check of tightness of Ir-192 sources by immersion method was spent. The dimensions of the active part of the source are =3.0 mm, h=4.0 mm.
For complete set gamma flaw detector of Gammarid 192/120М with source of Ir-192 in the special installation source of Ir-192 was placed in the source holder, closed by cover and rolling was spent, source holder with source of Ir-192 with flexible shaft was connected and to gamma flow defector of Gammarid 192/120М protective radiating head was charged. Then Ir-192 source together with gamma flow detector of Gammarid 192/120М for carrying out of gamma-radiographic NDT method of pipelines welded seams of quality assurance was used.
Non-destructive testing was carried out using source of Ir-192 of welded seams of metal designs and pipelines and gamma-radiography x-ray pictures was received (Figure 1). By NDT method with Ir-192 sources received x-ray images in terms of sensitivity and quality was corresponded to requirements of Russian standards (GOST-7512-82 «Control nondestructive control. Connections welded. Radiographic method») and USA standards (ASME).

Figure 1. X-ray picture of welded seam sample (=50.8 mm) received
by ionizing radiation source of Ir-192.

Primary authors

U.T. Ashrapov (The Institute of Nuclear Physics of the Academy Sciences, Tashkent, Republic of Uzbekistan) I.I. Sadikov (The Institute of Nuclear Physics of the Academy Sciences, Tashkent, Republic of Uzbekistan) Sh.R. Malikov (The Institute of Nuclear Physics of the Academy Sciences, Tashkent, Republic of Uzbekistan)

Presentation materials