ISO DIS 8690:2019 pdf free
ISO DIS 8690:2019 pdf free.Measurement of radioactivity – Gamma ray and beta emitting radionuclides – Test method to assess the ease of decontamination of surface materials
Test specimens coated with organic surface materials can, in addition, be tested without any prior cleaning when subject to special requirements. In such cases, the preparation of the test specimens shall be carried out in accordance with the manufacturer’s instructions by the center performing the test in conditions, which preclude any soiling of the surfaces to be investigated. If the cleaning stage is omitted, this shall be noted in the test report.
Dispense a 100 μL aliquot of the contaminant solution on the centre of each of three sheets of window glass, measuring 50 mm × 50 mm, in accordance with the procedure laid down in 8.2. The positioning aid (see 5.6) or a similar device may be used. Evaporate the drops to dryness under infrared lamps at a maximum temperature of 45 °C. Place the detector (as specified in 5.2) in the same measurement geometry (particularly with the regard to the distance of the contaminated glass surface from the detector) that to be used for the test specimens (see 8.3.2). Measure the pulse rate detected on the three glass sheets.
It is to be ensured that the measurement geometry ( particularly with regard to the distance of the contaminated glass surface from the detector) is the same as it was planned for the measurement on the test specimens (see 8.3.2).
Insert a test specimen into the positioning aid (5.6) with its reference corner R as shown in Figure 3. Bring edges A and B of the test specimen into close contact with lines a and b of the positioning aid, the contact B-b having priority. Then press the test specimen against upper part U containing the silicone rubber ring by fastening the screws until the test specimen is in contact with upper part U along all its edges.ISO DIS 8690 pdf free download.
