Some exciting new equipment arrived in the Kaman
Conservation lab this year- a Faxitron digital cabinet X-ray machine! Thanks to
the support of the Commemorative Organization of the Japan World Exposition
('70) and the Türkiye İş Bankası, which helped fund the purchase of this equipment, we can now x-ray a wide
range of objects. This will be especially useful to investigate metal finds
with thick corrosion and small block lifts prior to micro-excavation.
Our x-ray machine can fit objects up to approximately 15 x 18 x 18 inches;
however, the digital sensor at the bottom of the cabinet is 9 x 11.5 inches,
limiting what we can x-ray at any one time to that size. Since our unit has a
digital x-ray sensor, we don’t have to use x-ray film or plates- which is the reason this type of
radiography is called 'direct radiography'. Our Faxitron (model 43855)
goes up to 130 kV, and is semi-automatic- meaning we control the camera/sensor from
the computer but we have to set the kV and turn the x-ray source on and off directly on the Faxitron cabinet.
Our new protocol is to x-ray all of our small metal finds prior to treatment. This is incredibly useful as it allows us to better understand the shape and condition of an object when bulky corrosion is present, sometimes helping us to detect an original surface. X-ray imaging also aids in the decision-making for treatment, and assists the conservator in the investigative cleaning process. For example, prior to treating this copper alloy object, identified as a stamp, conservation intern Claire D’Izarny took an x-ray with the new Faxitron. The design on the face of the stamp showed up clearly in the x-ray and helped Claire understand where to clean away the corrosion and burial soil obscuring the design.
While we love our new tool, we are still exploring the different
applications for our machine. We hope to post any exciting finds and updates
here and we would love to hear about other people’s experiences with similar
machines! In the meantime, here are some more x-rays for your viewing pleasure...
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