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- since 1996 -
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Hajar
Hajar
12:31 Jun-17-2015
How to calculate the safe distance for x-ray

I have a big problem,
I have a 250 kV and 2 mA for x-ray .. I know how to calculate using point source for safe distance, but i know nothing when using x-ray. Could you help me ? Please explain using formulation .. Thank you.

 
 Reply 
 
Kratus Ranieri
Kratus Ranieri
18:07 Jun-25-2015
Re: How to calculate the safe distance for x-ray
In Reply to Hajar at 12:31 Jun-17-2015 (Opening).

I think that it is necessary the information about the radiation output as a function of kV at a determined distance. This output is not constant for all equipment and shall be given by the specific x ray manufacturer. On the other hand it shell be get by direct measurements. Than one can apply the distance square inverse law.

 
 Reply 
 
rooney
NDT Inspector,
Vietnam, Joined Jun 2013, 25

rooney

NDT Inspector,
Vietnam,
Joined Jun 2013
25
14:28 Apr-13-2016
Re: How to calculate the safe distance for x-ray
In Reply to Kratus Ranieri at 18:07 Jun-25-2015 .

I have the same question.

 
 Reply 
 
Laurent
Consultant,
France, Joined Mar 2016, 16

Laurent

Consultant,
France,
Joined Mar 2016
16
17:41 Apr-14-2016
Re: How to calculate the safe distance for x-ray
In Reply to Hajar at 12:31 Jun-17-2015 (Opening).

Hi Hajar

A on site method:
Use your dosimeter and adjust it in order to measure a quantity of radiation and not a flow of radiation.
Place it in most negative case meaning in the beam 1 meter after the windows of ejection.
Turn on your X ray equipment to the max during for exemple 2min.
So you have the quantity of radiation at 1 m during to min.
As it you can define the flow of radiation in Gray by hour (D1). For the full body of an human 1 Gy = 1 Sv
As D1/L2²=D2/L1² you can define the maximum limit of the area where D2 is the flow for public area.
If you have only the annual dose divide it by the number of legal working hour of your country to have a flow Sv/h.
Hoping to have been enough clear

1
 
 Reply 
 
Joe Buckley
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 526

Joe Buckley

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
526
23:26 Apr-18-2016
Re: How to calculate the safe distance for x-ray
In Reply to Laurent at 17:41 Apr-14-2016 .

If you are not sure of the proper safe distances for using X-ray equipment, are not aware of the relevant legal requirements, and have not been fully trained and certified then it is very simple

DO NOT USE X-RAY EQUIPMENT!

This stuff is potentially very hazardous. It is not a game for the 'casual user'

I have been working with NDT equipment in other fields for 35 years. I know the Physics, but there is absolutely no way I would touch this equipment without competent supervision.

 
 Reply 
 
rooney
NDT Inspector,
Vietnam, Joined Jun 2013, 25

rooney

NDT Inspector,
Vietnam,
Joined Jun 2013
25
04:43 Apr-19-2016
Re: How to calculate the safe distance for x-ray
In Reply to Joe Buckley at 23:26 Apr-18-2016 .

Dear Mr Joe Buckley,
Thank for your recommendation. But if you know the answer please let us know. Don't just recomend that people should stay away from it, people should be qualified because everybody who come in to this question knows that It is harzardous and people are asking how to avoid it. And not only qualified people relate to this activity but others as well.

 
 Reply 
 
Joe Buckley
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 526

Joe Buckley

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
526
10:21 Apr-19-2016
Re: How to calculate the safe distance for x-ray
In Reply to rooney at 04:43 Apr-19-2016 .

The point is this is not a question where someone can tell you the answer. This is a safety critical situation where someone has to understand all the relevant facts, and applicable legislation. before they can make a proper assessment.

 
 Reply 
 
Laurent
Consultant,
France, Joined Mar 2016, 16

Laurent

Consultant,
France,
Joined Mar 2016
16
16:55 Apr-20-2016
Re: How to calculate the safe distance for x-ray
In Reply to Joe Buckley at 10:21 Apr-19-2016 .

This method is used by notified body in France and certainly in Europe and in the rest of the World to qualify each year the X-ray equipment because the information given by the manufacturer can be wrong...

Which method is used in UK?



 
 Reply 
 

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