Brief introduction

When it is necessary to focus on checking the radioactive nuclide content in special parts of the human body, in order to obtain a relatively low detection limit, a longer measurement time is required. Therefore, Zhongzhi Nuclear Safety has designed a seat type organ counterChairEasy-HPGe.

ChairEasy-HPGeComposed of two broad energy typesHPGeDetector and two1inchNaIDetector composition, high-purity germanium detector measures lung radioactivity,NaIThe detector measures thyroid radioactivity.ChairEasy-HPGeSpecial shielding and collimation designs were carried out from both the system structure (shielding of backboards, ground surfaces, etc.) and detector aspects to reduce the impact of environmental background on measurement results. Using Chinese standard human body models for efficiency calibration to ensure measurement accuracy.ChairEasy-HPGeThe detection limits for lung radioactivity are shown in the table1.

Table 1ChairEasy-HPGeLower detection limit for typical nuclides

picture1 ChairEasy-HPGeappearance

II application area

Can be used for on-site measurement of human organ radioactive nuclide activity in nuclear power plants, reprocessing plants, special nuclear material processing sites, etc.

III ChairEasy-HPGetypicalperformance index

• Structure: as shown in the figure1The integrated low background design features a back panel and ground surface10cmLow background steel, fixed bracket;
• Detector shielding:5Centimeter low background lead;
• Detector: Two50%Efficiency wide energy type
• use10cmMade of thick low background steel, total weight4000kg, Floor Area1.2m×0.9mThe height (interior space) is190cm；
• Detector: Wide energy low background detector, capable of detecting energy range10KeVarrive3MeVEfficiency from30%arrive170%Optional;
• Electric refrigeration unit: The lifespan of the refrigeration unit is greater than10Ten thousand hours;
• The energy spectrum analysis software adoptsGammaSharpSpectral analysis software;
• Spectrometer: using the one from Zhongzhi Nuclear Safety Technology Co., LtdGammaSpectrum-1Spectrometer;
• Optional accessories: uninterruptible power supply, capable of maintaining a working time of four hours, can be customized according to user needs.

4 ChairEasy-HPGeFEATURES

• Fully automatic operation from energy scale to measurement result report, especially suitable forNon professional personnel use；
• have3000Radiation information of multiple isotopes;
• The shielding room adopts a door free design, which facilitates personnel entry and exit. In conjunction with the lead shielding around the detector, it effectively achieves shadow shielding;
• Adopting a wide energy low background detector, while surrounding the detector with10cmShielding with low background steel to further reduce the background;
• The detector adopts thermoacoustic cooling,No longer requiring additional liquid nitrogen supply and human maintenance, further reducing detector movementThe impact of liquid nitrogen shaking on the system;
• Integrated with Zhongzhi Nuclear Safety Technology Co., LtdGammaSharpThe powerful functions of energy spectrum analysis software can quickly analyzeIdentification and localization of nuclides.