Harwell Red 4034 Dosimeters

Red 4034 are made from radiation-sensitivepoly-methylmethacrylate (pmma) in the form of optically transparentpieces individually sealed in laminate sachets. They darken whenirradiated, and the radiation-induced darkening, accuratelymeasurable by means of a spectrophotometer, is a function of theradiation dose absorbed.

Dose Range

Red 4034 has a functional dose range of 5 kGy to 50 kGy whichmakes it idea for a wide range of irradiation processes.

Material

The 4034 Red is made from single batches of cast sheets ofpoly-methylmethacrylate (pmma)

Dimensions

Harwell Dosimeters then cut the sheets down into plaques of 30mmx 11mm with a thickness of 3mm (+/- 0.55mm)

Packaging

After **** inspection the dosimeters are packaged into sealedsachets made of polyester/aluminium foil/polyester/polyethylenelaminate. With each sachet being labeled with a unique bar codedlabel.

Packed 1,000 per carton.

(Packing to defined AQL's checked to BS6001 (ISO 2859-1), singlenormal inspection, level II.)

Measurement reproducibility

Coefficient of variation of specific absorbance measurements onsets of dosimeters for the batch, simltaneously irradiatedtogether, in a gamma radiation field uniform within +/- 1%, is 2%over the entire calibrated range, 5 to 50 kGy.

Calibration quality

Over the calibrated range, all mean specific absorbance datapoints thus obtained are within 2% of a fourth-order polynomialleast-squares fit to the data.

Shelf-life

Ten years from the date of release.

Traceability

Harwell calibration is traceable to the UK standard of absorbeddose at the National Physical Laboratory (NPL).