Measuring dose (dosimetry) involves exposing one or more dosimeters along with the target material. Dysprosium is used in dosimeters for measuring ionizing radiation. The workers wore hazmat suits and hazmat masks, carrying dosimeters that alerted at 80 millisieverts. Biological measurements will be compared to data provided by onboard radiation sensors and dosimeters. MOSFET dosimeters are now used as clinical dosimeters for radiotherapy radiation beams. Despite the radiological dangers, they had no radiation suits, no respirators, and no working dosimeters. They are now largely superseded by electronic personal dosimeters for short term monitoring. A total of 18,875 film badge dosimeters were issued to personnel during the operation. Quartz fiber dosimeters are made in different ranges. The company also produces access control devices design against theft and dosimeters. The embassy was equipped with dosimeters and protection outfits for field studies. They are now mostly superseded by electronic personal dosimeters and thermoluminescent dosimeters. The following table compares features of dosimeters. The crew deployed cosmic ray dosimeters near Trinity Lake and Breccia Hill. Film badge dosimeters are for one-time use only.