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Radiograph-identifying-means

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Radiograph identifying means

Details

Inventors: Sheldon, Andrew D.;
Assignee:
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:

A flexible character-indentable plastics embossing tape (11) is backed by and bonded to a lead strip not more than 0.025 inches (i.e. approximately 0.65 millimeters) thick, to form a tape suitable for identifying radiographs. The lead strip (13) is itself backed by a relatively thin and flimsy plastics or fabric strip (15) which, when removed, allows the lead (and hence the lead-plastic tape as a whole) to be pressure-bonded to the surface to be radiographed. A conventional tape-embossing gun is used to indent the desired characters in succession, and in order, into the lead-backed tape, without necessarily severing the lead; and then the backing strip (15) is peeled away to expose the layer (14) of adhesive which pressure-bonds the indented tape to the object to be radiographed. X-rays incident on the embossed tape will cause the raised characters (a) to show up dark on the subsequently-developed film, while the raised side areas (b) will show up white. Each character will thus stand out on the developed film.

DETAILED DESCRIPTION The invention is based on the concept of indenting the desired identifying characters into a lead-backed plastics embossing tape which can then be stuck on to the object to be radiographed.
If the thickness of the lead backing strip of such a tape is suitably chosen, the tape can be produced on a tape-embossing gun of the kind which is already familiar for use with plastic embossing labelling tape.
Such a gun may be modified to handle the lead-backed tape with which the invention is concerned, but it is entirely possible to use some guns without modification and still produce wholly satisfactory radiograph identification sets of characters on the tape.
By indenting the lead-backed tape, and pushing each individual character up out of the plane of the lead strip and into the thus embossed plastic strip above it (without necessarily severing the lead character completely from its surrounding lead strip) the individual characters will stand out on the radiograph when the radiographic film is developed.
The use of a lead-backed tape to produce a radiograph identifying set has many advantages over the conventional method method previously outlined.
The method is clearly far quicker and neater than the previous individual-character-and-adhesive-tape method.
It is also far cheaper: not only can the expensive individual lead characters be dispensed with, but the lead-backed tape now proposed can be made sufficiently cheaply for each tape produced to be discarded after having been used once.
Every new identifying set can be individually produced and the previous problems are eliminated.
Plastic embossing tape currently available is self-adhesive once its plastic backing strip is removed.
Lead-backed tape embodying the invention can similarly be made self-adhesive and can be supplied with an easily-removed backing strip of plastics or other suitable material.
The ease of application of such self-adhesive strip when compared with the previous conventional method is obvious and needs no further elaboration

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