QS-WBMis an in-vivo monitoring system for measurement of internal radioactive contamination in radiation workers handling HEP emitters. It is developed in response to the need of the DAE facilities for rapid and efficient whole body monitoring of radiation workers following internal contamination due to gamma emitting radio nuclides. This covers most of fission and activation products encountered at various nuclear and radiological facilities. The system can also be used for monitoring members of the public (MOP) during any radiation emergency. Monitoring time can be set to as low as 1 min. making it high throughput system (~ 25-30 persons per h). The system is designed to achieve sensitivity comparable with conventional WBM for a 1 minute counting time and accommodate 99% of the body dimensions. The QS-WBMmainly consists of four components: QS-WBM Shield enclosure, Rectangular shaped large size NaI(Tl) detectors, Multi-Channel Analyzers and associated electronics,local Wi-Fi network connecting different peripherals of the system and QuSDA WBM software (ver. 1.0). It performs all steps from monitoring of subject to CED evaluation and report generation.

1. High throughput -monitor ~30 persons per hour.
2. One Minute counting time.
3. Convenient standing counting geometry.
4. 0.3 – 2.0 MeV gamma energy range.
5. Two large size Na(Tl) detectors.
6. Lead shielded enclosure with SS covering.
7. Easy to assemble and dismantle.
8. No moving parts, low maintenance.
9. Except detectors all components are indigenous.
10. Rapid assessment of WBC data.
11. Accommodate 99% of body dimension of Indian adults.
12. Information on localized internal contamination can be obtained by analyzing individual detector spectrum.

Shield

1. Total weight – 4000 kg
2. Lead bricks of 50 mm thick
3. Floor space required 1.3 m x 1.0 m
4. Height – 2.2 m

Detector & MCA

1. Rectangular shaped NaI(Tl) detector (2 Nos.) of size - 406 mm(L) x 127 mm(W) x 76 mm(D)
2. 1 K GSPEC Multi Channel Analysers (2 Nos.)
3. Energy Range 0.3 to 2 MeV
4. QuSDA WBM window 10 based Software with intuitive GUI.

Efficiency Calibration of QS-WBM

1. Efficiency calibration to be done using BARC reference BOMAB phantom.
2. Calibration of the system will be carried out by IDS, during installation & commissioning as well as later at a fixed periodicity of once in a year.
3. Health of the system to be checked daily using disk sources of ¹³⁷Cs, ⁶⁰Co (50 kBq strength each).

Detection Limits – Typical MDA but actual system performance will vary with ambient environmental background

Sr. No.	Radio nuclide	MDA (Bq) - 1 min. Counting Time	MDD (μSv) - 1 min. Counting Time
1	137Cs	325	16
2	60Co	250	132

Quick Scan Whole Body Monitor (QS-WBM) is anin-vivo monitoring system for measurement of internal radioactive contamination in radiation workers handling high energy gamma emitters. It is developed in response to the need of the DAE facilities for rapid and efficient whole body monitoring of radiation workers following internal contamination due to gamma emitting radio nuclides. This covers most of fission and activation products encountered at various nuclear and radiological facilities. The system can also be used for monitoring members of the public during any radiation emergency, if need arises. Monitoring time can be set to as low as 1 min. making it a high throughput system (~ 25-30 persons per h). The system is designed to achieve sensitivity comparable with conventional WBM for a 1 minute counting time and accommodate 99% of the body dimensions of Indian occupational workers. The QS-WBM is a partially automated, unattended type and cost effective system, capable of monitoring large number of persons with minimum manpower. It perform all steps from monitoring of subject to CED evaluation and report generation.

1. High throughput -monitor ~30 persons per hour.
2. One Minute counting time.
3. Convenient standing counting geometry.
4. 0.3 – 2.0 MeV gamma energy range.
5. Two large size Na(Tl) detectors.
6. Lead shielded enclosure with SS covering.
7. Easy to assemble and dismantle.
8. No moving parts, low maintenance.
9. Except detectors all components are indigenous.
10. Rapid assessment of WBC data.
11. Accommodate 99% of body dimension of Indian adults.
12. Information on localized internal contamination can be obtained by analyzing individual detector spectrum.

Shield

1. Total weight – 4000 kg
2. Lead bricks of 50 mm thick
3. Floor space required 1.3 m x 1.0 m
4. Height – 2.2 m

Detector & MCA

1. Rectangular shaped NaI(Tl) detector (2 Nos.)of size - 406 mm(L) x 127 mm(W) x 76 mm(D)
2. 1 K GSPEC Multi Channel Analysers (2 Nos.)
3. Energy Range 0.3 to 2 MeV
4. QuSDA WBM window 10 based Software with intuitive GUI.

Efficiency Calibration of QS-WBM

1. Efficiency calibration to be done using BARC reference BOMAB phantom.
2. Calibration of the system will be carried out by IDS, during installation & commissioning as well as later at a fixed periodicity of once in a year.
3. Health of the system to be checked daily using disk sources of ¹³⁷Cs, ⁶⁰Co (50 kBq strength each).

BARC reference BOMAB phantom for efficiency calibration of QS-WBM system

Typical MDA are tabulated below along with the minimum detectable doses for annual monitoring frequency

Sr. No.	Radio nuclide	MDA (Bq) - 1 min. Counting Time	MDD (μSv) - 1 min. Counting Time
1	137Cs	325	16
2	60Co	250	132

1. Measurement of internal radioactive contamination due to gamma emitting radionuclides in human body during normal as well as in emergency situations.
2. Useful for nuclear facilities involved in handling of High Energy Photon (HEP) (Eγ>200keV) emitters i.e. fission and activation products.These facilities are nuclear power plants, research reactors, research laboratories, isotope production, reprocessing, waste management, defence etc.

Space

1. Mechanical fabrication facility and workshop with trained manpower for handling of Stainless Steelstructure and lead bricks. It requires ~ 50 square meter working space. The load bearing capacity of the floor for the system should be minimum 15 T/m².

Man Power

1. Team for mechanical fabricationand Electronics / Computer / Instrumentation Engineer, for hardware and software assembly & testing of the instrument.

Power Supply

1. Adequate power supply for mechanical workshop.

Test Equipments

1. Standard Test & measuring facility for electronic systems like Oscilloscope, DVM, soldering machine etc.