Related Manuals for KEXINSHE MEASALL KC761
Summary of Contents for KEXINSHE MEASALL KC761
- Page 1 Handheld Radiation multimeter (Radiation Dosimeters and Gamma-Spectrometers) KC761 User Manual KEXINSHE...
- Page 2 Shi Congwei, Xu Nuo, Yang Tianhao, Ke Wei KC761 Multifunctional Handheld Energy Spectrum Analyzer User Manual Author(s): Liu Hu （instrument Institute, Kechuang Institute） KEXINSHE Correspondence to the Agency: ma@kc.ac.cn First edition, August 2023 Opening: 841×1189 1/642 First printing August 2023 Stamp: 0.5...
- Page 3 Security matters In this brochure: "Dangerous" means a matter that may result in personal injury; "Warning" means a matter that may lead to the loss of equipment or a major error; "Important" refers to a statement that requires special attention. Dangerous Remove the sensor module.
- Page 4 please observe local laws and regulations. Pay attention to the energy range, paying particular attention to dose measurements that are not suitable for low-energy rays (e.g., low-energy X rays), where the results may be grossly underestimated. Disclaimers This instrument is a professional device, not a consumer product, and the rules for consumer products do not apply.
- Page 5 not an official feature. Users should fully assess the risks of networking before enabling the networking function. When networking, the user should ensure that the tested object does not involve state secrets, trade secrets, personal privacy or other non-disclosable contents, and know that the data may be erroneous, tampered with, contaminated, stolen, etc.
- Page 6 and maintained properly according to the requirements of the battery manufacturer. b. 5V±10%, ripple <0.5% via USB (Type-C) interface. Due to the low power consumption, some cell phone chargers will assume there is no load and automatically sleep. Chargers with PD fast charging protocol cannot be powered (no CC pin pull-down resistor).
- Page 7 whichever comes first. The warranty period of the optional sensor is determined separately. During the quality guarantee period, the manufacturer is responsible for free repair if the product fails due to quality problems. The following are not covered by the warranty: Aging, wear and tear, appearance damage;...
- Page 8 evaluated and explained to the user if it is not covered by the warranty. The repaired equipment must not be radioactive or contaminated with other dangerous substances, and the activity of induction radioactivity must not exceed 2.5nCi, otherwise the user will be held responsible. Environmental Protection This instrument contains plastic housing, circuit board and its attached electronic components, metal parts (brass, iron and nickel, tin plating),...
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Page 9: Table Of Contents
Table of Contents 1、 Overview ................................1 1.1、 Principle of energy spectrometer ....................3 1.1.1、 Scintillation detector ....................... 3 1.1.2、 Semiconductor detectors ....................... 5 1.1.3、 Multi-channel analyzer ......................7 1.2、 Energy resolution ..........................9 1.3、 Dose rate ............................. 10 2、 Features and functions of the instrument ....................13 2.1、... -
Page 10: 1、 Overview
1 Overview An energy spectrometer is a powerful radiation testing instrument, usually used to test the energy and magnitude of rays. The common Geiger counter is an old and simple instrument, which usually can only determine the magnitude of the radiation and provides very limited information. - Page 11 other, the shorter the wavelength (the higher the frequency), the greater the energy. In the case of X rays rays or γ-rays, using wavelength as the horizontal axis is not intuitive enough, so instead, using energy as the horizontal axis and size as the vertical axis, the plotted spectrum is the energy spectrum.
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Page 12: Principle Of Energy Spectrometer
possible to distinguish between normal fluctuations and the presence of a nuclear leak. In other words, by the time a nuclear leak can be detected with a Geiger counter, the situation is already more serious. Energy spectrometers, however, can provide more accurate information - even if the magnitude of the radiation does not change significantly - and can provide immediate warning of a nuclear accident or explosion as soon as artificial radionuclides, which are only found inside a nuclear reactor, are detected. - Page 13 crystals (standard), or europium-activated strontium iodide crystals (optional). After receiving irradiation from the rays, the scintillator emits fluorescence, usually in the visible range. Due to the photo-quantum characteristics of the high-energy rays, a flash of light is produced for each portion of the rays shining on the crystal.
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Page 14: Semiconductor Detectors
electronic circuitry performs charge-to-voltage conversion (Q-V conversion), pulse shaping (pole-zero phase elimination, S-K filtering), and peak hold, and then sends it to the ADC for sampling. After the ADC completes one sampling, the CPU immediately resets the analog circuitry and waits for the next pulse to arrive. In the extreme case, 80,000 pulses can be collected per second, which corresponds to a dose rate of approximately 1 mGy/h. - Page 15 impossible to penetrate the housing of the instrument, so the housing is opened with windows. The PIN is sensitive to visible light and the window must be shaded from light, as well as being dust or water resistant. On the inside of the window, there is an aluminized Mylar film with a maximum thickness of 5μm.
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Page 16: Multi-Channel Analyzer
contact the chip, shortening the life of the chip, such failures are not covered by the warranty. PIN detectors, although they provide a dose rate display, are converted to 662 keV γ -rays, which is highly influenced by the type of radiation measured, its energy and the measurement environment, making readings unreliable. - Page 17 classification is needed, either dozens or hundreds of single-channel analyzers are used, or the voltage range of the single-channel analyzer response is regularly adjusted. The former is very clumsy, and the latter takes a long time and is not suitable for situations where multiple voltages need to be observed simultaneously.
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Page 18: Energy Resolution
different fitting curves and need to be calibrated at the time of production to solve for the coefficients of the function. With these coefficients, the channel address can be converted to energy and the transverse coordinates can be rearranged in linear or logarithmic energy to obtain an energy spectrum plot. For example, if an instrument picks up 10,000 pulses, there are 9,998 in 1,000 channels and 2 in 333 channels, so it is possible to know the energy corresponding to 1,000 channels, for example, there are 9,998 copies of 1... -
Page 19: Dose Rate
about 12%, with optional 7% and 4% sensors available in the future. Since the energy spectrum is a count of pulse heights, obviously the more pulses collected, the better. In order to get a nice energy spectrum quickly, the distance between the instrument and the radioactive source should be adjusted to find a position where the dose rate is large, but not over the range. - Page 20 measure accurate dose rates, and energy spectrometers are no exception. （1）Impact of energy The electrical pulses caused by the rays must be above a certain voltage to trigger counting. If the threshold is set too low, noise will also be perceived as a pulse and produce false counts.
- Page 21 large radiation is measured as small. In order to reduce the probability of misleading, as soon as the scintillation detector exceeds the range, the instrument immediately switches to other means to avoid missed alarms. The strong radiation testing capability of the instrument is mainly used to avoid missed alarms, and the confidence level of the dose rate is not high.
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Page 22: 2、 Features And Functions Of The Instrument
2 Instrument features and functions The parts of the instrument are shown in the figure below: 2.1 Features of the instrument （1）Feature-rich Equipped with 2.54cm cesium iodide (thallium) scintillation detector and 9mm PIN detector as standard, it can measure α, β and γ rays. Each sensor has a separate multi-channel analyzer, all of which can perform spectral analysis and counting. -
Page 23: Sensor
can work continuously for about ten days. The power-saving state can further extend the time. （3）Complete, portable The overall mass is about 300g. Most functions can be achieved without connecting to a computer or mobile app. （4）Full range of interfaces With Bluetooth, WIFI and RJ45 network interface, it can be connected to cell phones and computers, and can be remotely observed through the cloud platform (optional). -
Page 24: The Performance Of The Instrument
Information of each sensor is as follows: （1）KC7601.21 (Standard) 10×10×25.4mm CsI(Tl) crystal ，2×9mm SiPM ，energy resolution about 12%. Option: Shielding copper block for providing directionality, which can be inserted into the reserved slit of KC7601.21. （2）KC7601.22 (Optional, not yet released) 10×10×25.4mm CsI(Tl) crystal, 9×9mm SiPM, resolution about 7.5%. - Page 25 At completion of production, in the range of 100 to 10kcps, uncertainty ≤ ± (5% + 20keV) at 23±5°C, or typical uncertainty ± (2% + 10keV). （2）Energy resolution of γ-rays Subject to the technical parameters published by the sensor. Additional resolution degradation of the instrument (95% confidence level): ...
- Page 26 absolute accuracy is not guaranteed, and users can calibrate it by themselves. Counting rate nonlinearity ≤ 10% (in sensitive energy range, at 10cps to 5kcps). Energy scale of β-rays at 23±5℃: (50keV～2MeV). Typical uncertainty ±20% (room temperature, vacuum, reference value, not guaranteed). Energy scale of α-rays at 23±5℃: (1.5MeV～6MeV).
- Page 27 （8）Stability Temperature stability: within the range of -20～45℃, amplitude drift ≤±10%, energy drift ≤±5% (temporarily not guaranteed). Long-term stability: typical value of amplitude drift ±10%/a, typical value of energy drift ±5%/a (temporarily not guaranteed). （9）Power consumption and battery life The expected endurance time when using alkaline dry batteries under natural background radiation environment is as follows: C-Ray Sensors Other sensors...
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Page 28: 3、 Installation Of The Instrument
there may be performance degradation, display backlight not bright or shell damage. 3 Instrument installation The instrument is shipped without batteries. If the instrument is used as a fixed sensor, it can be used without batteries and powered by USB or POE only. - Page 29 Insert the tab tool into the notch above the battery cover located on either side of the back clip and lift the top of the battery cover with force. Then drag the battery cover and pull it out. Load three 5AA batteries according to the direction marked in the battery box.
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Page 30: Fixed Installation
Reinstall the battery cover in the reverse order. Battery cover is more difficult to install, first plug the tail lug into the positioning hole, and then press close to the screw side with force several times, while paying attention to the state of the waterproof seal. If the seal comes off from the slot on the outside of the cover, the seal should be plugged into the slot first. -
Page 31: Install Tf Card
For temporary fixing, use the hook holes on the back clip. The instrument has a certain ability to protect against rain under the premise that the protective film is available and the waterproof rubber plug is tightly plugged. If the waterproof rubber plug is opened (for example, to connect the network cable), the protection ability will be significantly reduced, and the interface should be made downward and appropriate waterproof and moisture-proof measures should be taken. -
Page 32: Enabling The Network
3.4 Enable Network The connection function of the instrument is off by default, and should be turned on in the software if you need to use it. Power on → FUNC → Network setting → RJ45 interface → On. It works in the default way after the first opening, and you can modify the setting by yourself. -
Page 33: 4、 Operation Guide
FUNC setting. In heavy and very heavy power saving state, the pulse output function is not effective. Four-segment pins must be used, and the PULSE output must not be short-circuited over time. The headphones should be slowly placed close to the ear to feel the sound level. - Page 34 The display style may change as the program is updated. To save power, the instrument uses a 240×160px monochrome dot matrix LCD screen and the backlight can be turned off at any time. When the backlight is turned on, it will increase the power consumption by about 3mA, and the battery life will be significantly shortened.
- Page 35 （1）Power Switch Press and hold the power switch for 0.2 seconds to power on in the off state, and press and hold it for 1 second to power off in the on state. In the power-on state, short press the power switch to enter the power- saving state, as detailed in 4.2.1.
- Page 36 Short press to store the current spectrogram, spectral table, dose rate table and accumulated dose into TF card. Long press to turn on the automatic storage function, and store the spectrogram and number table into TF card by fixed time interval. The icon will be shown on the display when auto-storage is on.
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Page 37: Function Description
Confirm setting key. A few of them take effect in real time. （8）Menu selection Used to operate the options on the soft menu. （9）Pulse indication When using a PIN or neutron sensor, the pulse indicator flashes immediately when the sensor receives radiation particles. For scintillation detectors, the pulse indicator flashes once every 8 to 64 pulses, in line with the buzzer, due to the high count rate. - Page 38 power-on state. If there is no operation and alarm, the instrument will automatically enter the power saving state after the set time. The power saving status is divided into two levels, in the FUNC menu of the power saving settings (POWER SAVE) item, you can set the specific entry into what kind of level, the factory default is light power saving.
- Page 39 In light power saving, the energy spectrum or count operates normally, and only the interaction function is turned off. If radiation exceeding the alarm threshold is encountered, the power saving state will be aborted and returned to the regular state with an alarm. b.
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Page 40: Basic Model
To avoid misunderstanding, Auto Power Off (APO) and Auto Power Save cannot work at the same time, only one of them can be turned on. In the power saving state, if the battery is low, the buzzer beeps once a minute for a long time. -
Page 41: Sensor Selection
priority mode, but the graph area is slightly smaller and the value area is larger. Only one sensor can be used in this mode. If a scintillation detector is used and its range is exceeded, it automatically switches to strong radiation mode and the dose rate curve is updated as usual. - Page 42 alarm, and total dose alarm. Each alarm is further divided into two levels: general alarm and serious alarm. The dose (equivalent) rate alarm is on by default, the setting range of general alarm threshold is 1μSv/h to 99μSv/h (factory default is 10μSv/h), and the setting range of severe alarm threshold is 0.1mSv/h to 9.9mSv/h (default is 1mSv/h).
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Page 43: Menu Settings
General alarm: a slow beeping sound, a single-color flashing alarm light, and a short periodic vibration prompt. Severe alarm: a sharp beep or alarm sound, alarm indicator multi-color alternating high light flashing, repeatedly issued twice a set of vibration prompts. After the alarm is issued, if the instrument is low on power, the system automatically turns off the vibration, reduces the brightness of the alarm light, and the sound signal remains unchanged. -
Page 44: Mode Menu
sensor and registers the sensors with normal communication to the sensor list of the instrument. The instrument interrogates and registers in the following order: left sensing module, right sensing module, and PIN detector. When the instrument is turned off, the settings and dose accumulation data made in the power-on state are stored. - Page 45 Return to the menu before pressing the Back/BACK MODE key The above table is for reference only. The instrument reads the type of sensor installed in each sensor compartment at power-up and displays them in the order of left and right sensors and PIN sensors, so the names of the options depend on the sensors installed.
- Page 46 cursor by moving the spectrum) to one end of the display area, continue moving to the other end. Press and hold the PEAK option, or after one continuous peak search, turn off the cursor and press again briefly to redisplay. The [Secondary Menu] Scale/SCALE menu options are as follows: Option Name...
- Page 47 Energy spectrum Display the channel address/CH after pressing the key Energy/keV horizontal coordinate BACK Return to [Secondary] menu * The units of accumulated dose (equivalent) are switched simultaneously. A list selection is used, giving all options, moving the cursor up and down with the “-” and “+” buttons, and the Confirm/OK and Exit/ESC buttons appear on the soft menu.
- Page 48 for energy or equivalent accordingly. The [Secondary Menu] Configuration/CONFIG menu options are as follows: Option Name Function Notes With setting page Unit Settings Press the button to select the unit of dose (rate) UNIT SENS Select Sensor Link sensor selection menu BACK Back Return to mode main menu...
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Page 49: Func Menu
UNIT Settings Page Catalog Option Name Function Notes RATE Dose rate unit Select the unit of dose (equivalent) rate* Curve vertical coordinate There are three selectable items: count rate, dose (equivalent) LEVEL rate, and cumulative dose (equivalent) BACK Return Return to secondary menu *The units of the accumulated dose are switched synchronously;... - Page 50 field and needs to be activated again separately for the field that needs to be set. Illumination Brightness Lighting brightness Set the brightness of the backlight Lighting duration Set the duration of the illumination after it is Bright duration activated by a short press Disp Contrast Display Contrast...
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Page 51: Other Matters Requiring Clarification
Set up network, WIFI, Bluetooth and other NETWORK Set connection parameters connection functions Auto data saving Configure storage functions Set up automatic storage Device information Firmware upgrade Includes restoring the factory, clearing the RESET Reset instrument accumulated dose, etc. Four options are included in the RESET/RESET menu: Clear Dose Curve, Clear Accumulated Dose, Restore Factory Settings, and Exit. -
Page 52: Usage Tips
(2) Peaks above resolution are clearly unrealistic, e.g. needle-like peaks in the high-energy band should be ignored. (3) Scintillation detectors can respond to higher energy β-rays, which can also produce tough radiation and behave as a continuous spectrum. When testing, attention should be paid to the interference of βradiation. (4) The PIN detector has a little sensitivity to γ-rays. - Page 53 the long axis direction give better energy resolution and peak-to-concept ratio. In addition, the thickness of the housing at the window is much thinner than elsewhere, which facilitates the transmission of low-energy X rays. For the neutron detector (optional), the 22 mm length of the moderator is on the side near the window.
- Page 54 Unless it is really necessary, no objects, especially metals or metal- containing minerals, should be blocked between the measured source and the instrument. Metals or minerals should also not be present near the source. These objects may produce more severe fluorescence, scattering and other effects when irradiated by the source, which can degrade the quality of the ray energy spectrum and easily lead to failure of nuclide identification.
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Page 55: Finding Unknown Sources
It should be noted that excessive radiation can cause peak drift beyond the nominal uncertainty range. Due to the characteristics of the circuit, it is difficult to completely eliminate baseline drift when the count rate exceeds 10kcps. The higher the count rate and the higher the ray energy, the more severe the drift. - Page 56 recommended to use the dose-first mode. If the reading becomes significantly larger after moving to a certain direction, the source is most likely to come from that direction. If it is not convenient to get close to the source, you can also observe the direction of the significant decrease in reading, its opposite direction is the direction of the source.
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Page 57: Protection Of The Quality Of The Energy Spectrum Map
reduce fluorescence, copper shielding should be used. The dose rate and the distance from the source are squarely decreasing. Moving the instrument in the direction of the source, the distance to the source can be initially estimated based on the trend of the dose rate becoming larger or decreasing. - Page 58 measuring it on a board. If a lead box is to be used, a larger volume should be used to keep the source away from the lead. (3) For the lower activity of minerals, powders, etc., rather extend the measurement time, but also to avoid relying on increasing the number to improve the activity.
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Page 59: 5、 Maintenance
5 Maintenance This product does not normally require special care, but there are still some issues that need attention in order to keep the instrument in good condition. 5.1 Stability of the energy scale As described in Chapter 1, the gamma spectrometer corresponds c-ray photons to data through flash, photoelectric conversion, charge-voltage conversion, pulse shaping, and analog-to-digital conversion. - Page 60 where the temperature or air pressure fluctuates frequently and rapidly. Nor should the sensor be crushed or subjected to strong vibrations. The energy scale should be calibrated at least once a year after the instrument has been commissioned, or shorter when conditions permit, and every three months for the first six months.
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Page 61: Using Batteries
calculated according to the following formula: In the case of two known sources, one of them should try to be in the low- energy range of 50 to 300 keV, while the other should try to be in the high- energy range of 500 keV to 1.5 MeV, and the energy gap between them should not be too small. - Page 62 the battery that is about to run out of power to force support. When the battery voltage is lower than the protection point, the automatic shutdown prompt will be displayed and the buzzer will beep one long time every minute. If there is no operation, it will shut down after 30 minutes, and re-timer if there is operation.
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Page 63: Use Of External Power Supply
power and try to use external power supply. Since writing to a TF card consumes a lot of power, if the battery is close to being exhausted or the contact is poor, the moment you press the store button may cause the voltage to drop, resulting in data loss. - Page 64 and if there is a failure, it should be discontinued and repaired; the shell and its accessories, such as protective film, rubber plugs, seals, etc., can be ordered from the manufacturer if they are defective. (2) Keep clean, wipe the shell with clean water, do not use alcohol or other organic solvents.
- Page 65 (8) The instrument contains a very sensitive amplifier circuit, so please keep away from electromagnetic radiation. When implementing important tests, make sure that the distance from cell phones, walkie-talkies and other sources of radiation is more than 0.5 meters. Avoid carrying it in the same pocket as a cell phone, and do not hang it on the same side of your body with a walkie-talkie.
- Page 66 Note page 1...
- Page 67 Note page 2...
- Page 68 Equipment Resume Model: Serial Number: Filled in by the user Date of activation: Date Summary User...
- Page 69 KC761...
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