HRDa—150b α, β, Shed, γ radiation contamination measuring instrument

Function overview

HRDa-150b type α, β, gamma radiation contamination measuring instrument has the characteristics of large area, high sensitivity, multi-function, easy operation, mainly used for measuring the α, β radiation contamination level and gamma radiation dose on the surface of objects. Due to the characteristics of the detector, it is also sensitive to the measurement of C-14 and low energy Gamma rays (fluorescence). The instrument is suitable for measuring the α and β pollution of the wall, the table, the workpiece, the floor and the body surface parts of the occupational staff and the work clothes. It is widely used in nuclear material factories and mines, workshops, laboratories, environmental protection testing and other relatively stable and sensitive environments.

The probe of the instrument is a thin window flow air proportional counter, can be used directly to measure the ordinary specifications of the gas tank in the instrument cylinder, do not need to inflate the instrument tank. The instrumental readings are given by a backlit lattice LCD display, and can be switched for α, β, Shed and γ measurements.

The measurement is operated by the handle key, easy to control, and set manual and automatic zero clearing count two working modes. With over threshold alarm, over range alarm, battery undervoltage alarm and other functions. The instrument has a built-in rechargeable lithium battery. When the built-in battery is insufficient, two AA 3.6V disposable lithium batteries can be installed in the handle battery compartment to replace it.

Main technical index

The instrument is a portable all-in-one machine, including a 150cm2 flow type proportional counter probe, high voltage circuit, measurement module, operating unit and LCD liquid crystal display. The measuring gas medium is canned butane gas, which can be directly loaded into the air silo of the instrument for use, and there is no need to frequently fill the instrument with air.

(1) Detector: flow-air proportional counter, sensitive window area 150cm2 (15.5cm×9.7cm).

(2) Background count: α background ≤3cpm, β background about 480cpm (γ environmental radiation < 0.2uGy/h).

(3) Detection efficiency: α efficiency: ≥30% (241Am or 239Pu, 2π direction, 150cm2 source from the window surface 5mm); β efficiency: ≥40% (204Tl or 90Sr-90Y, 2π direction, 150cm2 source 10mm from the window surface.

(4) The detection efficiency of 14C beta ray is more than 25%.

(5) Measurement range: α count rate: 1 ~ 2000cps; β count rate: 1 ~ 5000cps; γ dose rate: 0.01μGy/h ~ 10mGy/h, γ absorbed dose: 0.00μGy ~ 999.99mGy.

(6) relative inherent error: ≤±20%.

(7) Measurement timing: for α and β measurement, 1s, 10s, 60s, ∞ four optional, ∞ maximum 99h59m59s; γ measurement response time: the shortest 1s, the slowest 5s, automatic adjustment.

(8) Measurement alarm value setting: α count rate can be set arbitrarily within the range of 1-2000cps; Beta count rate can be set arbitrarily in the range of 5-4000 cps. γ dose rate is continuously adjustable from 1μGy/h to 10mGy/h; Alarm is indicated by red LED indicator light and built-in buzzer.

(9) Power supply: built-in 7.4V rechargeable lithium battery, according to the rated capacity of continuous working time > 72 hours. Under voltage can be loaded into the handle battery compartment two AA size 3.6V disposable lithium batteries instead.

(10) Battery undervoltage alarm: when the battery voltage is ≤6.6V, the instrument displays the undervoltage symbol. When the battery voltage is less than or equal to 6.4V, the system automatically shuts down.

(11) Working environment characteristics: temperature 0℃ ~ 45℃; Relative humidity: 30% ~ 90% (at 30℃).

(12) Probe cover: protect the probe window film; The effect of α and β rays can be effectively blocked when γ is measured in the mixed field of α/β/γ radiation, and the effect of γ radiation can be judged when β is measured.

(13) Measurement medium: butane gas (butane), directly into the specified size of butane gas tank, do not need frequent inflation.

(14) Weight: 1.6kg.

Dimensions: 225 (L) x 118 (W) x 163 (H, including handle).