UTsim-Realtime UT Simulator

Sometime last year I made a post about a very useful real-time UT simulator software. Click here to see that post. That software has evolved further the developer of the software has included on their trail version flaw detection of TKY joint configurations, AUT and TOF, the simulator software is now called UTsim. They even have their own dedicated website. Click here. Thank you to the developers of these innovative software it is really a very useful tool for those who have chosen to become NDT practitioner.

Watch the full demo video.

Geometric Unsharpness

Geometric unsharpness refers to the loss of definition that is the result of geometric factors of the radiographic equipment and setup. It occurs because the radiation does not originate from a single point but rather over an area.

The three factors controlling unsharpness are source size, source to object distance, and object to film distance. The source size is obtained by referencing manufacturers specifications for a given X-ray or gamma ray source. As the source size decreases, the geometric unsharpness also decreases. For a given size source, the unsharpness can also be decreased by increasing the source to object distance, but this comes with a reduction in radiation intensity.

The object to film distance is usually kept as small as possible to help minimize unsharpness. However, there are situations where geometric enlargement occurs, such as when the object distance from the film is increased, which will reduce the definition.

Codes and standards used in industrial radiography require that geometric unsharpness be limited. In general, the allowable amount is 1/100 of the material thickness up to a maximum of 0.040 inch. These values refer to the degree of penumbra shadow in a radiographic image. Since the penumbra is not nearly as well defined, it is difficult to measure it in a radiograph. Therefore it is typically calculated.

I have made up a simple excel calculator, this is simple to use.




Download Ug Calculator V1.1

NDT Multiple Choice Question and Answer

IF you are planning for NDT certification and looking for NDT test exercise, don’t look further here is NDT Cabin-Multi Choice Software.



This tool instantly gives your score upon completion of each exercise. There five NDT discipline test choices:

Radiation Safety (Test 001)
Radiation Theory (Test 002)
MPI Theory (Test 003)
Ultrasonic Theory (Test 004)
Dye Penetrant Theory (Test 005)

Three choices for test time:

Expert - 5 mins.
Average - 10 mins.
Beginner - 15 mins.



There is no need to install the software just create a folder on you’re My Documents or any directory you prepare, label folder to NDT Cabin or any name you like. Unzip this download on the folder you have created, create a shortcut to your desktop of the application file named NDT Cabin Multi-Choice and you’re ready to start.

Good Luck!

Download NDT Cabin Multi-Choice Software