Posted: 3:29 am ET
On January 10, the State Department issued solicitation #19AQMM18Q0014 for radiation dosimeters. The small business set-aside firm-fixed price contract is for a base year minimum order quantity/quarter of 450 units, and a maximum order quantity/quarter of 475 units, with four option years of the same minimum/maximum requirements. So 1900 units for the base year or 9500 units total in five years. The order is solicited on behalf of Diplomatic Security’s Office of Security Technology (DS/C/ST):
The Government requies a wearable device that records exposure to ionizing radiation that does not contain electronic equipment. It is anticipated that the device will be returned to the vendor for reading and reporting back to the Government the amount of radiation exposure recorded on the device (see Radiation Survey Results Report for more information on the reporting deliverable).
The anticipated order quantity is up to 475 devices. The anticipated ordering frequency is quarterly. No less than 450 devices will be ordered per quarter.
Delivery of the device is required 30 days from award of the BPA call to the X-Ray Program Manager (to be identified upon BPA award).
Radiation Survey Results Report: Radiation survey results reports are to be delivered to the X-Ray Program Manager (to be identified upon BPA award) within 30 days of receipt of returned device for those devices with a reading of over 50 milliRem (mR). Electronic copies of the report will be accepted, and is preferred, and electronic archiving options are also acceptable and preferred.
The Department of Homeland Security (DHS) did a survey on radiation dosimeters back in 2015 and established the System Assessment and Validation for Emergency Responders (SAVER) Program to assist emergency responders making procurement decisions. Here is what it says about dosimeters:
Dosimeters are radiation safety devices worn to quantify an individual’s accumulated radiation dose incurred from external sources to evaluate the potential for harmful health effects of radiation. Dosimeters differ from other radiation detection devices that are designed for the purpose of preventing a radiological release by alerting a responder to the presence of radiation.
It appears from the State Department solicitation description that they are looking for processed dosimeters (and not self-reading dosimeters or electronic personal dosimeters, the latter generally the most expensive, largest in size, and most have visual, auditory, or vibratory alarms). Below is what DHS says about processed dosimeters:
Processed dosimeters are based on thermoluminescence (TL), optically stimulated luminescence (OSL), or direct-ion storage (DIS) technologies. Thermoluminescence dosimeters (TLDs) and OSL materials contain defects in their crystal structure that trap electrons released by exposure to radiation. In TLDs, the trapped electrons are subsequently freed by stimulation with heat, while OSL uses stimulation with light. In both types, after stimulation, the resulting light emission provides a measure of the radiation dose received. Specialized equipment is used for this readout, either by the user with field-portable or lab-based equipment, or by a dosimetry processing laboratory. A commercial dosimetry service can be contracted to supply dosimeters on a regular basis, read out returned dosimeters, and provide dose tracking and record keeping. TLDs and OSL dosimeters are offered in either a clip-on brooch format or identification card style. DIS devices use an analog memory cell inside a small, gas-filled, ionization chamber. Incident radiation causes ionizations in the chamber wall and in the gas, and the charge is stored for subsequent readout. The DIS dosimeter is read at the user’s site through connection to a web-based system via a universal serial bus (USB) port or Bluetooth connection to a computer or smart phone. The DIS dosimeter is designed to clip to a breast pocket. Processed dosimeters are also considered passive devices in that they do not have an on/off switch, though DIS devices do contain a small inaccessible battery to maintain their charge or for communications. Processed dosimeters are widely used in health and safety programs for radiation workers such as nuclear
The purpose of a dosimeter is for worker protection. The potential hazardous effects of radiation depend on the radiation level. For very high doses (hundreds of R), the effects are immediate (“acute”) such as blood and skin damage or infertility, and the severity of the effect increases with dose.4 For lower radiation levels, the effects are not immediately life threatening; the long term accumulated dose is of interest because the probability (but not the severity) of effects such as cancer increase with dose.
Radiation dosimeters are routinely used in occupational radiation environments in the nuclear industry and at medical facilities. In contrast, except for some hazardous material response teams, most emergency responders do not routinely use radiation dosimeters. Responders may need dosimeters in the event of a radiological release such as a terrorist attack involving a radiological dispersal devise or an improvised nuclear device. Since emergency response scenarios span a wide range of potential radiation levels that could be initially unknown, many factors must be considered in the selection of a radiation dosimeter.
The State Department solicitation notes that the Radiation Survey Results Report are to be delivered to the X-Ray Program Manager within 30 days of receipt of returned device for those devices with a reading of over 50 milliRem (mR). More from DHS’s market survey report:
One of the most important factors influencing selection of radiation dosimeters is the magnitude of radiation levels that an instrument can measure – for example, a very sensitive device with a low minimum range is useful for alerting users to the presence of radiation but may go off-scale and not function in a high radiation field. The operational range of a dosimeter will determine how it can be used during the response, and several guidance documents provide reference values that help define what ranges are applicable. For example, the National Council on Radiation Protection and Measurements (NCRP) defined radiation control zone perimeters for emergency response to nuclear and radiological terrorism, where the “cold zone” is the area where the exposure rate is less than or equal to 10 mR/h, the “hot zone” is an area with exposure rate greater than 10 mR/h, and the “dangerous-radiation zone” is at 10 R/h and higher. Accumulated dose guidelines have also been developed by the Environmental Protection Agency (EPA) and the NCRP to guide tactical emergency response decisions, such as 10 rem for property protection operations and 25 rem and higher to conduct lifesaving missions, 5 or 50 rad to decide whether to withdraw from a radiation area.
The ability to alarm or display instant results may be an important feature to consider in relation to the magnitude of radiation levels. For example, in a dangerous radiation field, a high range electronic device that can measure exposure rates with a real-time display and alarms could help a responder avoid potentially life threatening doses. In a lower radiation field, self-reading and field-readable processed dosimeters could be used to provide near real-time information. In both types of fields and during intermediate and late phase recovery operations, processed personal dosimeters could be used for later verification of field instrument readings and to track accumulated dose for long term health.