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- since 1996 -
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Lanh Huyet
NDT Inspector,
Vietnam, Joined Jun 2013, 25

Lanh Huyet

NDT Inspector,
Vietnam,
Joined Jun 2013
25
09:29 Sep-29-2014
X-ray focal spot size

Dear everyone,
X-ray machine has focal spot size 0.4 x 4mm.How to determine the source size in Ug formular?

DJ Kallhof
DJ Kallhof
18:18 Sep-29-2014
Re: X-ray focal spot size
In Reply to Lanh Huyet at 09:29 Sep-29-2014 (Opening).

This sounds like the focal spot of an anode tube. Unfortunately, I've never been able to get an answer to that question either. If you find someone with the answer, the next logical progression is, does the focal spot vary with the size of the plate being used. In other words, if you are shooting a 36.00" diameter part with an anode, is the focal spot for a 7.00" long plate the same if you are using a 24.00" plate? Is the size figured by the degree or the quadrant.

Jon Wallis
NDT Inspector, -
Netherlands, Joined Feb 2010, 626

Jon Wallis

NDT Inspector, -
Netherlands,
Joined Feb 2010
626
07:39 Sep-30-2014
Re: X-ray focal spot size
In Reply to Lanh Huyet at 09:29 Sep-29-2014 (Opening).

Not a problem in Europe.
According to Euronorm EN12543-1, once you have determined the length and breadth of the focal spot, the larger measurement is used as the focal spot size.

Kyle Lee
Kyle Lee
23:55 Oct-04-2014
Re: X-ray focal spot size
In Reply to Lanh Huyet at 09:29 Sep-29-2014 (Opening).

a2 + b2 = c2

16 + 16 = 32

Square root of 32

5.65 mm diagonal

Di Natale Sebastiano
Italy, Joined Oct 2014, 1

Di Natale Sebastiano

Italy,
Joined Oct 2014
1
11:01 Oct-05-2014
Re: X-ray focal spot size
In Reply to Lanh Huyet at 09:29 Sep-29-2014 (Opening).

I confirm the post by Jon Wallis
I would add that in EUROPE Snecma only uses the diagonal in determining the focal spot

RENGARAJU. B. N.
NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA., India, Joined Sep 2014, 106

RENGARAJU. B. N.

NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA.,
India,
Joined Sep 2014
106
14:10 Oct-05-2014
Re: X-ray focal spot size
In Reply to Lanh Huyet at 09:29 Sep-29-2014 (Opening).

Dear Member,

When using X-Ray machine, the source size in Ug formula shall be the focal spot size as may be determined by the process explained in SE-1165, Sub-Section - B, Article-22 of ASME Sec-V, under title "STANDARD TEST METHOD FOR MEASUREMENT OF FOCAL SPOTS OF INDUSTRIAL X-RAY TUBES BY PINHOLE IMAGING"

This method shall not only give you the focal spot size but also reveal how much degrading of the focal spot has occured due to tube age, tube over working etc.

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