Volume 7, Number 1
January 2008
Q. If a person cannot pass a color contrast test (the person may be color blind for instance), is that individual required to pass a shades of gray test? If so, what plates are used for this test? It seems to me the answer would be "yes" but I can't find a set of test plates for shades of gray. I looked through Interpreting SNT-TC-1A first but didn't quite find what I was looking for. Help would be appreciated. J.R., Brunswick, Ohio? A. The response made to Inquiry 86-1 in the third edition of Interpreting SNT-TC-1A is applicable to your question. The shades of gray test is not required. However, if the candidate fails the company color contrast test, the company can show by actual demonstration that he is capable of performing the work. The shades of gray test works well for RT. Most companies shoot a radiograph of different image quality indicators (IQI) and have the candidate identify T-holes and densities. Q. I was taught never to drag the yoke because it masks indications. Where I am currently employed, they drag the yoke. Are there new developments that now allow this practice or is it still unacceptable? A.D.? A. Although this question is appropriately directed to your company Level III, a search of documentation found no references that addressed masking as a result of dragging the yoke. However, the following should be noted: “If an AC yoke is positioned on a plate and, while being held in place on the plate, it is turned on and then off, the plate will be magnetized. A field indicator will show residual magnetism in the plate. Alternatively, if the AC yoke is positioned on a plate, turned on and while still on, it is dragged down the plate, the plate becomes demagnetized. A field indicator will show no residual magnetism.” Q. What’s the cancellation policy for ASNT exams and refresher courses? H.H., Houston, Texas A. Applicants wishing to cancel or reschedule an exam or refresher course must notify ASNT two weeks in advance of the date of the examination or refresher course. In addition, there is an administration fee of $75 applied for each exam or course that is cancelled or rescheduled. All fees must be remitted to ASNT before the deadlines stated above. No exam or course attendance is permitted unless all fees are paid. Fees paid by applicants that wish to cancel are refunded less any administrative fees.
TNT
E-mail, fax or phone questions for the Inbox to the Editor:
hhumphries@asnt.org
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