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Technical Discussions
Rigzang tashi
Engineering,
Punatsangchhu-I Hydroelectric Project Authority, Bhutan, Joined Aug 2015, 12

Rigzang tashi

Engineering,
Punatsangchhu-I Hydroelectric Project Authority,
Bhutan,
Joined Aug 2015
12
06:58 Dec-26-2016
exposure time calculation in Radiography Testing of higher thickness steel

Experts/Seniors/Teachers!

Radiography Testing of Higher thickness steel i.e. 63mm to 100mm is carried out by Gamma Rays (Co-60). The exposure time calculated by my NDT lvl-2 is coming around 40mins for 75mm thick.

what would be the exposure time from your side?

 
 Reply 
 
srinivas
NDT Inspector,
kalva engineers pvt ltd, India, Joined Oct 2012, 35

srinivas

NDT Inspector,
kalva engineers pvt ltd,
India,
Joined Oct 2012
35
08:53 Dec-26-2016
Re: exposure time calculation in Radiography Testing of higher thickness steel
In Reply to Rigzang tashi at 06:58 Dec-26-2016 (Opening).

Sir
please provide data for SFD, type of film (fast/slow), film density-(2-4)

 
 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
12:47 Dec-26-2016
Re: exposure time calculation in Radiography Testing of higher thickness steel
In Reply to Rigzang tashi at 06:58 Dec-26-2016 (Opening).

Source strength, Source to Film Distance, Film Speed, Sensitivity desired are the main parameters that will determine the exposure time. And I am wondering why you are doubting your level II...

 
 Reply 
 
Rigzang Tashi
Engineering,
Punatsangchhu-I Hydroelectric Project Authority, Bhutan, Joined Aug 2015, 12

Rigzang Tashi

Engineering,
Punatsangchhu-I Hydroelectric Project Authority,
Bhutan,
Joined Aug 2015
12
04:52 Dec-27-2016
Re: exposure time calculation in Radiography Testing of higher thickness steel
In Reply to srinivas at 08:53 Dec-26-2016 .

Shrinas sir,

SFD=380mm, Type of film= D7, and Film Density=2(min)

 
 Reply 
 
collin maloney
NDT Inspector, - Plant Inspector
Applus RTD, Australia, Joined Nov 2000, 147

collin maloney

NDT Inspector, - Plant Inspector
Applus RTD,
Australia,
Joined Nov 2000
147
07:11 Dec-27-2016
Re: exposure time calculation in Radiography Testing of higher thickness steel
In Reply to Rigzang Tashi at 04:52 Dec-27-2016 .

You haven't told us what the source strength is! however a quick calculation is around 250 curie minutes, so if he is correct, then your source strength is 6.25 curies. These parameters also indicate that the UG will be outside requirements

 
 Reply 
 
Rigzang tashi
Engineering,
Punatsangchhu-I Hydroelectric Project Authority, Bhutan, Joined Aug 2015, 12

Rigzang tashi

Engineering,
Punatsangchhu-I Hydroelectric Project Authority,
Bhutan,
Joined Aug 2015
12
06:26 Dec-28-2016
Re: exposure time calculation in Radiography Testing of higher thickness steel
In Reply to collin maloney at 07:11 Dec-27-2016 .

Thanks for your kind response.

I am wondering whether that Gamma rays (Co 60) is feasible to carry out such high thickness steel with its energy level of 1.33 or else we can use X-ray in lue of that.

 
 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
11:05 Dec-28-2016
Re: exposure time calculation in Radiography Testing of higher thickness steel
In Reply to Rigzang tashi at 06:26 Dec-28-2016 .

Co 60 is indeed a good choice for that thickness. You would need X-ray sources of MeV range to do a radiography. If you have such machines, go ahead.

 
 Reply 
 

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