Provision of Handheld Radiation Monitoring Equipment

Public Health England (PHE) is seeking to purchase hand-held contamination monitors and multi-purpose survey meters. The equipment will be used to perform alpha and beta contamination survey applications and performing low-level survey applications in the outdoor environment. The hand-held monitor and survey meters must consist of the detector (probe) attached to a compatible portable scaler/rate-meter via a connecting cable and meet the following mandatory features.

The probe must: - Be lightweight (<500 g) - Be able to operate in outdoor temperatures at least between -10 to +40°C. - Have alpha and beta-gamma measurement capabilities - Utilise a ZnS:Ag plastic scintillator to provide maximum detection efficiency. - Have a uniform response across the active area.

The GM probe must: - Be lightweight (less than 500 g) - Be portable, not exceeding dimensions of 350 mm x 50 mm (Length x Diameter). - Be able to operate in outdoor temperatures ranging between at least -10 to +40 °C. - Be energy-compensated for a relatively flat H*(10) energy response (within +/- 30% when normalised to 137Cs) over the range of 60 keV to 1.2 MeV. - An isotropic response. - Have a response to 137Cs of at least 14 cps/µSv h-1 H*(10).

The hand-held monitor and survey meter must: - Be compatible with the above probe. - Be lightweight (less than 200 g) and ergonomically-designed for measurements in the field. - Be supplied with rubber 'bump' protection to minimise damage during handling in the field. - Have ingress protection suitable for outdoor use. - Be portable (hand-held), not exceeding dimensions of 125 x 70 x 70 mm (H x W x L). - Be able to operate in outdoor temperatures ranging between at least -10 to +40 °C. - Be designed to work with standard 'off the shelf' standard-size batteries (alkaline and/or rechargeable), providing at least 500 hours of operation (assuming the backlight is off), and provide a battery indication. - Have various modes of operation, including count-rate (cps) and integrated-counts modes (scaler/timer) with both preset-count and preset-time, as well as a dose-rate mode (µSv/h). - Have an adjustable High-Voltage (HV) supply over the range of 400 to 1000 volts. - Have an inbuilt probe library that stores settings for multiple probes, including HV, calibration factor, dead-time correction, and overload threshold. - A digital numeric display. - A backlight facility. - An audible response of count-rate and dose-rate with adjustable alarm thresholds.

The complete instrument 'kit' must be supplied with a robust weatherproof storage/transport case which houses the complete kit of probe, survey-meter, tripod, and accessories.

If you feel that you can meet the above requirements or would like more information, then please contact Aysel Sarzosa ([email protected]) The closing date and time for any queries is 25 February 2020 at 12:00 pm.