Collimators are essential component of Industrial Radiography set up as they provide radiation safety to the operating personnel and general public at large by directing the emerging radiation beam to the useful area of exposure.
A collimator with optimum design features also helps in reducing the scattered radiation which is turn results in radiographs with better sensitivity. Considering the above factors, tungsten collimators with light weight and compact design suitable for directional and panoramic type of exposures have been developed by Radiation Equipment Pragramme of BRIT.
The collimators are fabricated using the above tungsten alloy and 304 stainless steel material as cladding. The tungsten alloy sheild for the directional collimator is designed to provide a 50 degree radiation beam and is encased with stainless steel and totally sealed by argon arc welding.
The panoramic collimator is constructed with two shields designed to provide a 30 degree panoramic radiation beam. The shields are encased with stainless steel and totally sealed by argon arc welding. The collimators can be easily attached to the guide tube exposure head of ROLI-1 radiography camera with a thumb screw
|Directional Collimator :|
|Panoramic Collimator :|
|Shielding material||Tungsten alloy|
|Density||17.2 to 17.6 gm/cc|
|Half value layer for Ir.192||3.4 mm|
|Tenth value layer for Ir.192||11.22 mm|
|Intensity reduction||95% at the shielded areas|
|Directional Collimator||For unidirectional exposures|
|Panoramic Collimator||For Panoramic exposures|