Well I can only post of about a single
experience with X-rays but FWIW, it was pretty easy to arrange in Perth, Western Australia
When I purchased my current
boat about 12 years back, I had the keel bolts
x-rayed at the same time as the pre-purchase survey
. I phoned the first NDT company in the phone
book, explained what I wanted and they booked me in for the same day the boat was slipped at the yard in one of the bigger yachts clubs.
They turned up in a van fitted out as a mobile x-ray facility. They set up a few barriers, some signs and the equipment and as soon as the surveyor
had finished they took a few sample exposures in order to get a good film. It took a little while to get the exact spot while the lead keel joined the timber section of the keel. Once that was sorted and the correct exposure was determined, they took a series of films in order to get a number of the bolts. There are 12 bolts and from memory I think we took x-rays of 4.
The films were processed in the mobile van and when the guys were happy with the results, they packed up and went home. I remember it took maybe an hour or two on site.
The report (a formal analysis) and the films were then posted to me a week later. The price
was around $300 or $400 IIRC.
At work, we occasionally used a similar procedure to x-ray some sections of main wing spars when required.
The bolts were monel (I think) and according to the NDT guys, they were fine with no signs of corrosion
, pitting or wasting at the lead interface or upwards from there to the keel / hull
join. They were about 30 years old at that time.
Clearly they couldn't tell me what they were like inside the lead portion of the keel.