where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

3101 views
Technical Discussions
Scott
Scott
01:46 Sep-16-2005
2% or Really 4% Sensitivity


The codes for radiography typically specify a 2-2T sensitivy level to be achieved.

Would this not really be a 4% level of sensitivity? The penetrameter is 2% of the thickness of the weld and the 2T hole diameter is 2x thickness of the penny. Does this not give 4% sensitivity?

2-2T really means, The 2 is 2% sensitivity (able to see 3 sides of the penny) and be able to see the 2T hole. But if you can see 3 sides but not the hole, is this still not 2% sensitivity.

Its a little confusing. Can someone please explain this.


 
 Reply 
 
S.V.Swamy
Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex , India, Joined Feb 2001, 787

S.V.Swamy

Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex ,
India,
Joined Feb 2001
787
05:14 Sep-18-2005
Re: 2% or Really 4% Sensitivity
Dear Scott,

The thickness of the penetrameter is so chosen that a difference in density of nearly 2% is seen on the film. The diameter of the hole, which is 2% of the strip is chosen so that a small detail like the hole is seen, thus confirming the technique's Image Quality. The sharpness of an image depends on several factors including the spectral quality of the radiation, the graininess of the film and the Source to the Film Distance. These need to be optimised so that a small detail like the penetrameter hole or a thin wire (for a DIN type penetrameter) is seen. That is the reason the penetrameter or penny is now called IQI Image Quality Indicator.

2-2T thus does not become 4%.

Swamy

----------- Start Original Message -----------
:
: The codes for radiography typically specify a 2-2T sensitivy level to be achieved.
: Would this not really be a 4% level of sensitivity? The penetrameter is 2% of the thickness of the weld and the 2T hole diameter is 2x thickness of the penny. Does this not give 4% sensitivity?
: 2-2T really means, The 2 is 2% sensitivity (able to see 3 sides of the penny) and be able to see the 2T hole. But if you can see 3 sides but not the hole, is this still not 2% sensitivity.
: Its a little confusing. Can someone please explain this.
------------ End Original Message ------------




 
 Reply 
 
Scott
Scott
05:27 Sep-18-2005
Re: 2% or Really 4% Sensitivity
Thats doesnt really answer what I was asking. The hole is not 2% of the strip (I assume you mean penny thickness)The diameter is 2x the tickness of the penny for the 2T hole. The 1T hole is 1X the thickness of the shim, which is 2% of th thickness of the weld. So I am still confused as to why a hole who's diameter is 4% of weld thickness is not considered 4% sensitivity.


----------- Start Original Message -----------
: Dear Scott,
: The thickness of the penetrameter is so chosen that a difference in density of nearly 2% is seen on the film. The diameter of the hole, which is 2% of the strip is chosen so that a small detail like the hole is seen, thus confirming the technique's Image Quality. The sharpness of an image depends on several factors including the spectral quality of the radiation, the graininess of the film and the Source to the Film Distance. These need to be optimised so that a small detail like the penetrameter hole or a thin wire (for a DIN type penetrameter) is seen. That is the reason the penetrameter or penny is now called IQI Image Quality Indicator.
: 2-2T thus does not become 4%.
: Swamy
: :
: : The codes for radiography typically specify a 2-2T sensitivy level to be achieved.
: : Would this not really be a 4% level of sensitivity? The penetrameter is 2% of the thickness of the weld and the 2T hole diameter is 2x thickness of the penny. Does this not give 4% sensitivity?
: : 2-2T really means, The 2 is 2% sensitivity (able to see 3 sides of the penny) and be able to see the 2T hole. But if you can see 3 sides but not the hole, is this still not 2% sensitivity.
: : Its a little confusing. Can someone please explain this.
------------ End Original Message ------------




 
 Reply 
 

Product Spotlight

Varex Imaging Large Field of View (FOV) Digital Detector Arrays (DDAs)

A larger FOV DDA can reduce the space and volume of the X-ray inspection system on the factory floor
...
, enable faster scanning times, better throughput and better resolution images at a lower dose. Customers can also save time and money. With these benefits in mind, Varex Imaging has designed a family of large FOV detectors (4343HE, XRD 1611, 4343DX-I, 4343CT) for our industrial imaging customers.
>

NDT Master Lecturer

In the program both university professors and practitioners will give lectures, which guarantees the
...
oretical depth and practical inside. Academic Director: Prof. Dr. Christian Boller
The following lecturers are not complete: Prof. Tadeusz Stepinski, Prof. Wieslaw Staszewski, Prof. Frank Walther, Prof. Giovanni Bruno, Prof. Gerd Dobmann, Prof. Philippe Guy
>

Compact NDT inspection-heads for measurements with active thermography

The compact inspection head is suitable for thermographic ndt tasks. The uncooled infrared camera
...
is specially developed for NDI-tasks and offers a thermal sensitivity until now known only from thermal imagers with cooled detector. All required components and functions are integrated into the inspection-head. You will only need an ethernet cable to connect the sensor with the evaluation system.
>

ISONIC 3510

Very Powerful Superior Performance Extremely Portable Smart Phased Array Ultrasonic Flaw Detector an
...
d Recorder with 2 Conventional UT and TOFD Channels uniquely combines PA, single- and multi-channel conventional UT, and TOFD modalities providing 100% raw data recording and imaging. Suitable for all kinds of every-day ultrasonic inspections
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window