Overview

The BS-6000 personal radiation dosimeter is an intelligent pocket instrument, which is made of a new-type and powerful single-chip technology. It is mainly used to monitor x-rays and y-rays, a-rays and β-rays, and directly read out personal dose and personal dose rate. ; Within the measurement range, the alarm threshold can be fixed or preset, and the working time can be preset to exceed the threshold or block. When the working time is exceeded, an audible and visual alarm will be issued to prevent excessive dose and protect the safety of workers. The main technical indicators of the instrument conform to national and international standards. It is a personal measuring instrument with small size and low power consumption among similar domestic instruments. It is widely used in industrial non-destructive testing, nuclear power plants, nuclear submarines, isotope applications and hospital cobalt treatment , Vegetables and fruits surface radiation detection and other fields.

Instrument features:

High sensitivity, stable and reliable, with an error of less than 5%.

X-ray and y-ray, a-ray, β-ray and multi-ray testing function are combined in one.

It can test the tiny radioactive dust on the surface of the object (the minimum activity of radioactive dust is 5 becquerels), and the user can test the amount of radioactive dust pollution on the surface of vegetables and fruits.

Measure the personal dose and dose rate at the same time, the user can customize the maximum instantaneous dose, the time can be customized, and the cumulative dose has multiple alarm functions;

Low power consumption and small size. Easy to carry.

Instrument appearance description
Liquid crystal display (LCD); 2. Working switch (ON); 3. Selection button (CHOICE); 4. Setting button (SET); 5. Alarm indicator (STATE); 6. Battery box.

working principle

The detector outputs a sequence of pulses under the irradiation of x, y, a, and β rays. The number of pulses corresponds to the dose rate of x, y, a, and β rays. After input and shaping, a standard pulse with a certain amplitude is sent to the single-chip microcomputer. , The single-chip microcomputer completes all digital processing functions, inputs LCD display, and exceeds threshold signal input acousto-optic circuit to alarm.

1. Detector: Use a high-sensitivity GM counter to reduce the difference between high and low energy response after energy compensation. The counter tube converts x, y, a, and β rays into electrical pulse signals, which are input into the single-chip circuit through input shaping.
2. Single-chip microcomputer: The single-chip microcomputer uses an 8-bit single-chip microcomputer with a liquid crystal display drive. It is characterized by high speed, low voltage, low power consumption, and single power supply. The single-chip computer completes all the digital processing functions: pulse counting, calculation display, time base generation, output alarm signal, etc.
3. Display: The display is a specially equipped 5-back pole segment display.
RATE: dose rate; ALARM: alarm; DOSE: dose; LOBAT: battery undervoltage; TIME: working time; BLOCK: background level setting and blocking alarm.
4. Alarm: The alarm circuit is composed of LCD and buzzer. It emits sound and flashes when the threshold value and working time are exceeded.
5. Buttons: There are three buttons on the instrument. One is the work switch "ON/OFF". When it is turned on, the instrument is in the display and working state, and when it is turned off, the instrument is in the off state. The second is to select the button "CHOICE", press this button, you can choose to display "RATE", "DOSE", "TIME", "BLOCK". The third is the setting button "SET". Press this button to manually set the alarm dose rate, alarm dose, alarm working time, and background dose.
6. High-voltage power supply: Two 1.5V dry batteries are supplied to the DC transformer to generate high voltage and supply the counter tube to work.

Technical index:

1. Detector: GM counter tube, measuring x, y, a, β rays;
2. Display range: 5-digit LCD;
Cumulative dose equivalent: HP (10) 0.00 usv--- 999.99 usv
Dose equivalent rate: HP (10) 0.01 usv/h---999.99 msv/h
3. Response time: 1-10 seconds
4. Dose rate response: <+5% (0.0 1 usv/h---999.99 msv/h)
5. Energy response: <+5% (50KeV---1.3MeV)
6. Relative inherent error: <+5% (137Cs)
7. Alarm function and alarm threshold:
The dose rate and cumulative dose can be preset with alarm thresholds within the measurement range. The instrument now has fixed alarm thresholds as follows:
① Cumulative dose: for every increase of 0.1 usv, a short sound and light are emitted; ≥50 usv, sound and light alarm 5S, with "ALARM" display.
②Dose rate: ≥25usv/h, sound and light alarm 6S, with "ALARM" display.
③Block alarm
When the counting tube is blocked, it will continuously alarm and display "ALARM" and "BLOCK".
8. Battery undervoltage indication
When the battery voltage is less than 2.7V+0.05V, the instrument displays the battery undervoltage symbol "LOBAT". When the undervoltage symbol appears, although it can work continuously for 24 hours in a low radiation location, the battery should be replaced in time.
9. Battery and power consumption Use two AAA 1.5V alkaline batteries (No. 7 batteries).
10. Temperature characteristics: <+3% -10℃-+50℃;
11. Humidity characteristics: <+3% 95%RH (+35℃);
12. Dimensions: 60 (width) X110 (length) X20 (thickness)
13. Weight: <75g (including battery <98g)

Instructions:

Battery installation and accumulated dose reset

Open the battery box cover and put the No. 7 battery into the box according to the correct polarity. At this time, the instrument makes a beep, and when it is used for the first time, it displays "DOSE", 000.00 usv. Because the instrument has a memory function, the accumulated dose cannot be cleared when the power is turned off. You must press the selection button "CHOICE" to switch to the "DOSE" state. Long press the SET button for 3 to 5 seconds to reset the accumulated dose. If necessary before clearing, record the original stored cumulative dose first.

Measure background dose

Before measurement, under the environmental background, turn on the work switch, after the accumulated dose is cleared, press the selection button "CHOICE", when "DOSE" is displayed, the LCD number will flash, and after 3 to 5 seconds, the "DOSE" status will be displayed 000.00 usv, the instrument is in the measuring state, every time 0.1 usv accumulates, a short beep will sound, and the indicator light will flash once;

Press the selection button "CHOICE", when it displays "RATE", the LCD number will flash. After 3 to 5 seconds, the "RATE" status displays 000.01 usv/h. When it displays "RATE", the instrument is in the measuring state, and the measurement is repeated. The bottom level, generally <0.5 usv/h.

Measurement

①Press the work switch (ON/OFF) button, the LCD screen will display and start the measurement.
Press the selection button "CHOICE" to display the characters "RATE", "DOSE", "TIME", and "BLOCK" respectively.

②When “RATE” is displayed, measure the dose equivalent rate in usv/h. The instrument currently has an alarm threshold of 25usv/h, radiation level ≥25usv/h, sound and light continuously alarm for 6 seconds, and "ALARM" character display, if the threshold is continuously exceeded, the sound and light will not alarm, but "ALARM" It is still displayed and does not disappear until it is below the threshold.
The instrument can also manually set the dose equivalent rate alarm threshold. If the set value is exceeded, the sound and light will alarm continuously for 6 seconds. The built-in alarm threshold of 25usv/h will temporarily not work. The operation of artificially setting the dose equivalent rate is as follows:
Press the selection button "CHOICE", when it displays "RATE", the first digit of the LCD number will flash, press the set button "SET", and the number will change cyclically from 0 to 9. After setting the first digit, press the select button "CHOICE", the second digit flashes, press the set button "SET", the number will change cyclically from 0 to 9. By analogy, the maximum number can be set to 999.99usv/h. After the last digit is set, press the selection button "CHOICE" to display the "RATE" measurement status.

③When “DOSE” is displayed, measure the cumulative dose equivalent in usv and msv. 0.1usv per record. The instrument emits a short beep and emits light once.
The instrument now has a cumulative dose alarm threshold of 50 usv, and the instrument will continue to alarm for 5 seconds every time the dose is increased by 50 usv.
The instrument can also artificially accumulate the dose equivalent alarm threshold. If the set value is exceeded, the sound and light will alarm continuously for 6 seconds. The built-in alarm threshold of 50usv will not work temporarily. The operation of artificially setting the cumulative dose equivalent is as follows:

Press the selection button "CHOICE", when it displays "DOSE", the unit usv will flash, press the set button "SET", the unit will change between usv and msv, after confirming the unit, press the selection button "CHOICE", the number is One digit will flash, press the "SET" button, and the number will change cyclically from 0 to 9. After setting the first digit, press the select button "CHOICE", the second digit flashes, press the set button "SET", the number will change cyclically from 0 to 9. By analogy, the maximum number can be set to 999.99usv or 999.99msv. After the last digit is set, press the selection button "CHOICE" to display the "DOSE" measurement status.

④When "TIME" is displayed, the alarm working time can be set manually.
The operation of artificially setting the alarm working time is as follows:
Press the selection button "CHOICE", when it displays "TIME", the first digit of the LCD number will flash, press the set button "SET", and the number will change cyclically from 0 to 9. After setting the first digit, press and touch the selection button "CHOICE", the second digit flashes, press the setting button "SET", the number will change cyclically from 0 to 5. By analogy, the third bit changes from 0 to 9, the fourth bit changes from 0 to 5, and the fifth bit changes from 0 to 9. The maximum time can be set to 9 hours, 59 minutes and 59 seconds.

⑤When “BLOCK” is displayed, the background radiation dose rate can be set. The unit is usv/h. After setting, the microcontroller will automatically reduce the background radiation dose.
The operation of setting the background radiation dose is as follows:
Press the selection button "CHOICE", when it displays "BLOCK", the first digit of the LCD number will flash, press the set button "SET", the number will change cyclically from 0 to 9. After setting the first digit, press the select button "CHOICE", the second digit flashes, press the set button "SET", the number will change cyclically from 0 to 9. And so on.

Downtime
Turn off the work switch and stop the measurement.

5. Matters needing attention:

If the instrument is not used for a long time, the battery must be removed to avoid damage to the instrument.
The user is not allowed to disassemble the instrument privately to avoid accidents.
When using and storing the instrument, it is necessary to prevent overheating, overcooling, humidity, impact, etc., to avoid damage to the machine.
The instrument should be placed in a place unsuitable for children to avoid accidents when children play as toys.