I. Overview
The BN-100N seat type organ counter is a new generation of internal radiation pollution measuring instrument, which can measure the radioactivity of important organs such as the thyroid and lungs in the human body. The instrument consists of one 5-inch sodium iodide detector and one 2-inch sodium iodide detector, which are used to measure the radioactivity of the human lungs and thyroid gland, respectively. BN-100N is mainly used in nuclear medicine, nuclear emergency, nuclear power plants, public safety, etc. 2、 Composition
5-inch sodium iodide detector, 1 unit;
2-inch sodium iodide detector, 1 unit;
Energy spectrum analysis software, 1 set;
Passive efficiency calibration software, 1 set;
Internal radiation dose assessment software, 1 set;
12 digital phantoms (optional);
Low background shielded seats, 1 set;
3、 Technical indicators
(1) 5-inch sodium iodide detector
Used for measuring lung radioactivity;
Energy measurement range: 50keV -3MeV;
Digital multi-channel: 1024 channels;
Energy resolution: ≤ 8.5%;
Integral nonlinearity: ± 1%;
Detection lower limit:
¹³⁴Cs:118Bq
¹³⁷Cs:144Bq
⁶⁰Co:181Bq
(2) 2-inch sodium iodide detector
Used for thyroid radiation measurement;
Energy measurement range: 50keV -3MeV;
Digital multi-channel: 1024 channels;
Energy resolution: ≤ 8.5%;
Integral nonlinearity: ± 1%;
Detection lower limit:
¹³¹I:125Bq
¹³³I:180Bq
(3) Spectral analysis software
Spectral analysis software is used to obtain spectral measurement results from detectors;
The software has functions such as spectrometer control, energy calibration, peak finding, efficiency calibration, peak fitting, activity calculation, uncertainty analysis, nuclide library setting, and report output.(4) Passive efficiency calibration software
Accurately model the measured object using CT and MR data;
Fast calculation speed. For a lung CT model with 256 × 256 × 178 voxels, it is possible to accurately calculate the efficiency scaling factors for all energies within 10 minutes.
Replacing the phantom for efficiency calibration saves a significant amount of phantom procurement costs and radiation source procurement expenses. There is no need for radiation source management, and the accuracy is much higher than the experimental efficiency calibration of the phantom.
Can be used for precise efficiency calibration of counters in other organs such as the thyroid and lungs.(5) Internal radiation dose assessment software
The internal radiation dose assessment software is used to estimate the internal radiation dose of the human body. The ICRP68-72 internal radiation dose assessment software can further provide the internal radiation dose and long-term damage caused by different radioactive nuclides to the human body based on the activity report provided by the energy spectrum analysis software.
The software can set different options such as nuclide, metabolic time, age, and tissue organs, fully considering the influence of different factors on internal radiation dose;
The software can provide the long-term internal radiation dose received by various organs;(6) Digital phantom
The use of passive efficiency calibration technology requires modeling of the human body, but passive efficiency calibration software cannot model complex human body models. Using human CT scan data can establish a digital phantom;
The software can convert DICOM files of human CT scan data into input files for particle transport software MCNP or Geant4, which can significantly reduce efficiency calibration errors caused by individual differences;
Can establish digital Monte Carlo phantoms for ATOM phantoms, totaling 12 human digital phantoms;
Modeling error: ≤ 1%;(7) Low background shielded seat
Seat style design;
The bottom plate is made of low background steel with a thickness of not less than 5cm;
The back is made of low background lead with a thickness of not less than 5cm;;
Floor area: 0.9m x 1.5m;
Weight: not less than 500gg;