TLD Radiation Measurement Services ::

Description

K & S Associates, Inc. offers accredited custom TLD dose measurement services for diagnostic and therapeutic patients using chips sealed in polyethylene with a stated uncertainty of 5% for single chip measurements. Diagnostic energy measurements may be made with TLDs calibrated at K & S or at the client's facility. Generally, therapeutic measurements on patients receiving high energy photon and electron beams are calibrated to the machine and energy at the client's facility. K & S maintains close traceability to the National Institute of Standards and Technology through a periodic Measurement Quality Assurance Program as a secondary accredited laboratory.

K & S uses the Harshaw TLD-100 LiF chips and a hand processing TLD system. The sensitivity each chip has been determined prior to shipment. The chips are sealed in polyethylene (approximately 0.004 inch thickness) and a unique identification number is associated with each chip. Each batch also includes several control chips for transit exposure assessment. TLD-100 powder and rods are also available.

A unique feature of the K&S TLD service is the Polydose System designed specifically for fluoroscopically-guided procedures (PCTAs, ablations, etc.). The K&S Polydose System allows the mapping of the skin dose to the patient through the use of polyethylene strips, patches, belts, sashes, vests and other shapes with the TLD chips sealed at spaced intervals or grids which are specified by the customer.

How The Service is Supplied

Single Chip Batch: The chips are sealed in polyethylene with a number on each packet. The packets are attached to a card with space for a description of the dose measurement site.

TLD Polydose System: The chips are sealed in a polyethylene tube carrier with a specified spacing. The overall length of the belt, width and location of the area of interest and the grid spacing may be specified by the customer. The standard units are a single row or double row of chips spaced 5 cm (2 inches) apart and the rows separated by 5 cm (2 inches). Grids from 1 cm to 10 cm are available.

For a slide presentation, click Polydose

Uncertainty: The uncertainty of the dose measurement system using a single chip is 5 % assuming good contact with the patient's skin. Positional uncertainty, however, depends on the careful placement and registration of anatomical references.

For a description of service, click TLD Service.
For an order form in PDF format, click TLD Form.

Orders received before noon are usually filled and shipped the same day.

Reports of dose measurements are usually faxed in a preliminary form the same day of readout. Generally, the chips are read out after 24 hours has elapsed after exposure.

For a quantity discount quotes - call 800-522-2325