- Email: [email protected]
Radiation sensitive paints
266
CURRENT
Functioning also as a two-channel synchronous wave analyzer, the transmissibility plotter is a dual-purpose instrument. It is easily expandable to a transfer function analyzer and, through choice of optional equipment, can be tailored into systems to meet a wide range of customer requirements. Radiation Sensitive Paints.--British industry has taken to using the relatively novel irradiation process for sterilizing medical and pharmaceutical products. In fact two such commercial plants are now being built using cobalt 60 sources to irradiate such things as disposable syringes, cat-gut, sutures, scalpels, etc. These products will be sterilized in sealed boxes, stored and used as required, so it is essential to be sure that they have been through this irradiation sterilization process. One way of doing this is to use a radiation sensitive paint on the container and preferably one which only changes color when the desired sterilizing dose has been exceeded.
TOPICS
[J. F. I.
Two scientists at the A.E.A's Wantage Research Laboratory have inven. t e d a suitable form of paint for this purpose which can be coated on self adhesive labels put on packages before irradiation. The paint comprises a plastic and an acid sensitive yellow azo dye. Under irradiation by gamma rays or high energy electrons, hydrochloric acid is released from the plastic and the yellow dye turns red. This radiation sensitive paint is covered by a thin layer of lacquer to absorb ultraviolet and the complete paint surface is then unaffected by acid vapors or dilute acid solution, or prolonged heating at 80°C. The sensitivity of this indicator paint can be reduced by incorporating acid absorbers--so that the color change only occurs at high radiation doses. The paints may at present be used where the total radiation dose falls within the range 100,000 rads10,000,000 rads.
CURRENT
Functioning also as a two-channel synchronous wave analyzer, the transmissibility plotter is a dual-purpose instrument. It is easily expandable to a transfer function analyzer and, through choice of optional equipment, can be tailored into systems to meet a wide range of customer requirements. Radiation Sensitive Paints.--British industry has taken to using the relatively novel irradiation process for sterilizing medical and pharmaceutical products. In fact two such commercial plants are now being built using cobalt 60 sources to irradiate such things as disposable syringes, cat-gut, sutures, scalpels, etc. These products will be sterilized in sealed boxes, stored and used as required, so it is essential to be sure that they have been through this irradiation sterilization process. One way of doing this is to use a radiation sensitive paint on the container and preferably one which only changes color when the desired sterilizing dose has been exceeded.
TOPICS
[J. F. I.
Two scientists at the A.E.A's Wantage Research Laboratory have inven. t e d a suitable form of paint for this purpose which can be coated on self adhesive labels put on packages before irradiation. The paint comprises a plastic and an acid sensitive yellow azo dye. Under irradiation by gamma rays or high energy electrons, hydrochloric acid is released from the plastic and the yellow dye turns red. This radiation sensitive paint is covered by a thin layer of lacquer to absorb ultraviolet and the complete paint surface is then unaffected by acid vapors or dilute acid solution, or prolonged heating at 80°C. The sensitivity of this indicator paint can be reduced by incorporating acid absorbers--so that the color change only occurs at high radiation doses. The paints may at present be used where the total radiation dose falls within the range 100,000 rads10,000,000 rads.