APPLICATION OF LARGE COBALT-60 SOURCES TO GAMMA-RADIOGRAPHY OF METALS

Journal Article · Fri Jan 01 04:00:00 EST 1960 · Nukleonika (Poland)

OSTI ID:4137404

Domanus, J; Osuchowski, B

Radiographic control of metal castings and weldings in Poland was previously limited to 150 mm of steel. X-ray machines and radioisotopic sources were used for this purpose. The increasing number of parts of larger thicknesses that must be radiographically controlled created an urgent need for applying larger radiation sources. For this purpose a Gamma Radiography Machine GRM 750 was procured containing a Co/sup 60/ source with a 715 c activity and a 15 mm diameter. Using this source a series of investigations were made to determine the maximum thickness range in steel which can be examined by means of Co/sup 60/ sources. Exposure charts were made for different filmscreen combinations, and optimum FFD were determined for various source sizes. Then comparison was made of posure times for sources of different activities. The land hole-defectometer and Polish Standards IQI. Results those obtained when using the 31 Mev betatron. Radiological protection measures were considered and comparisons were made for containers, protective barriers, and safe distances for sources of different activities. It was determined that gamma radiography of steel with Co/sup 60/ sources above 300 mm of thickness is unjustified both from technical and economical points of view. Sources stronger than 750 c of Co/sup 60/ are not suitable for gamma radiography. (auth)

• Research Organization: Electrotechnical Inst., Warsaw
• NSA Number: NSA-15-001769
• OSTI ID: 4137404
• Journal Information: Nukleonika (Poland), Journal Name: Nukleonika (Poland) Vol. Vol: 5; ISSN NUKLA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BETATRONS
CASTING
COBALT 60
GAMMA RADIATION
GAMMA SOURCES
METALS, CERAMICS, AND OTHER MATERIALS
RADIATION PROTECTION
RADIOGRAPHY
SENSITIVITY
STANDARDS
STEELS
THICKNESS
WELDING