6150AD-b high sensitivity environmental gradex. Gamma dose rate meter

The PTB laboratory scale in Germany is renowned as the world's environmental grade gamma dose rate meter

The system consists of a low background, large volume plastic scintillator detector and a host 6150AD 5 (AD 6);

Extremely high sensitivity: as low as 5nSv/h

Extremely wide energy response: 20keV~7Mev

Can simultaneously measure: instantaneous dose rate, average dose rate (displaying the standard deviation of the average dose rate), maximum dose rate, and cumulative dose

The dose (rate) alarm threshold can be adjusted (within the full range)

Automatic range conversion

The inherent background of the instrument is as low as 1nSv/h

x. Gamma dose rate meterTechnical Parameter

Dose rate range: 1nSv/h to 999mSv/h (the range of the built-in and external detectors of the host automatically changes)

Host 6150AD5: Dose rate range: 0.1uSv/h~999mSv/h Energy response: 40keV~3MeV

Probe 6150AD-b (/H)

Dose rate range: 1nSv/h to 99.9uSv/h

Linearity: Deviation max.. ± 10%, Cs-137 calibration

Excess range can be displayed up to 5 mSv/h

Weight/Power Supply: 2.5 kg/Battery 120h

Temperature and humidity range: -30^oC～50^oC；0～95%

Protection level: IP67 DIN40050

The benefits of keeping the curve flat over a large range are:

The current dose rate measuring instruments all use¹³⁷The Cs source scale refers to the response of the measuring instrument to photons with an energy of 662 keV, which corresponds to the instrument counting rate (cps) per unit dose rate (μ Sv/h). After calibration, the current field dose rate can be obtained based on the counting rate (cps). However, when the photon energy is different (such as⁶⁰Co）， The instrument response (CPS) corresponding to radiation fields with the same dose rate is different, and this response is different from the instrument response¹³⁷The normalized curve obtained by comparing the responses of Cs is called the energy response curve. The radiation field in actual measurement is not a single energy field, but a field with energy distribution within a certain range, known as the energy spectrum (see the comparison of different radiation field spectra in the figure below). In this way, the same instrument can¹³⁷The measurement results under Cs radiation field will be consistent with those obtained using single energy¹³⁷There is an error between the results of the Cs scale. Obviously, the energy response curve is flatter in a wider range, and the measurement results obtained using this instrument have smaller errors.

characteristic:

Compared with the "dose rate measurement" operation mode, the "average value" operation mode of 6150 AD-b is more suitable for low radiation measurement. The dose rate meter calculates an average value by calculating the number of pulses and measurement time from the start of the measurement system. The average value display can reflect the level of the current value, and the average value can be cleared and restarted by operation. When the probe is replaced or the measurement system is turned off, the average value can also be cleared and restarted.