The Harshaw 6600 Plus TLD Reader which is a new model of Harshaw 6600 TLD reader have basically proven to pass all the IEC criteria, which makes it for suitable for environmental dosimetry applications, such as measuring whole body which include: Hp (10) and Hp (0.07) extremities and also a system for monitoring neutron respectively.
Recently, the new model of the Harshaw 6600 Plus TLD Reader have a capacity of reading 200 TLD cards on the go or 800 TLD cards respectively.
Moreover, the Harshaw 2000 TLD Reader is another useful tool for research applications, monitoring whole body such as Hp (10) and Hp (0.07) respectively. The Harshaw 2000 Reader consists of two (2) robust pulse converters and a pulse converter for registering luminescence.
Furthermore, the Harshaw 4000 TLD reader is made up of a strontium -90 source.
This publication gives the various TLD readers that are used in personal monitoring service for all the Occupationally Exposed Workers in which serves as an integral component of institutional radiation safety programs in Ghana.
Harshaw 6600 TLD reader, Harshaw 6600 plus TLD reader, Harshaw 4000 TLD reader, Harshaw 2000 TLD Reader, Occupationally expose workers
There have been earlier generations of the Harshaw TLD Readers. Theses Harshaw TLD Readers include: TLD SYSTEM 4000, TLD 4500, TLD 2000 and TLD 3500 respectively. Recently, there have also been evolutions of the new version of the Harshaw TLD Reader, such as the Harshaw TLD reader such as Instadose, Harshaw 6000 and Harshaw 6600 Plus Reader respectively [1].
These various Harshaw TLD Readers are normally used for monitoring, which include measuring doses from whole body such as skin deep dose and deep dose Hp (10) and Hp (0.07) and also sometimes they can be used for neutron monitoring [2].
Currently there are four (4) available Harshaw TLD Readers in the Personnel Dosimetry Laboratory, these include:
1. Harshaw 4000 TLD reader
2. Harshaw 2000 TLD reader
3. Harshaw 6000 reader
4. Harshaw 6600 plus reader
The Laboratory (PDL) started using Harshaw 2000 TLD Reader, then the laboratory was stocked with Harshaw 4000 TLD Reader. In addition the International Atomic Energy Agency (IAEA) provided the Personnel Dosimetry Laboratory in Ghana Atomic Energy Commission at the Health Physics and Instrumentation Center at the Radiation Protection Institute with two (2) set of new Harshaw TLD Readers namely, Harshaw 6600 and Harshaw 6600 Plus TLD Readers, respectively [3] (Table 1 and Table 2).
The harshaw 4000 TLD reader
It incorporates both hot gas and planchet heating to read TLD cards, chipstrates, ringlets and unmounted dosimeters. One unique feature about the Harshaw 4000 TLD Reader is that the reader can read cards in two position simultaneously (Figure 1, Figure 2 and Figure 3).
Source used in harshaw 4000 TLD reader
• Type of Harshaw: Harshaw 4000 TLD Reader
• Isotope: Sr 90/gamma source
• Date: 9/12/1997
• Amount: 0.5 uCi.
Source used in harshaw 2000 TLD reader
• Type of Harshaw: Harshaw 2000 TLD Reader
• Isotope: Sr 90/gamma source
• Date: 9/12/1997
• Amount: 0.5 uCi.
Source used in harshaw 6600 TLD reader
• Type of Harshaw: Harshaw 6600 TLD Reader
• Isotope: Sr 90/gamma source
• Date: 9/12/1997
• Amount: 0.5 uCi.
Different sources are installed in the TLD readers with the exception of the Harshaw 6600 and Harshaw 6600 PLUS TLD Reader who have the same sources but different manufacturer dates (Figure 4, Figure 5, Figure 6, Figure 7 and Figure 8).
Sources of the readers: Different sources are installed in the TLD readers with the exception of the Harshaw 6600 and Harshaw 6600 PLUS TLD Reader who have the same sources but different manufacturer dates.
• Type of Harshaw: Harshaw 6600 TLD PLUS Reader (Provided by IAEA)
• Isotope: Sr 90/gamma source
• Date: 15 Mar, 2018
• Amount: 0.5 uCi.
• SN: AC - 3282
Normally, before the Harshaw TLD Readers can be used, the TLD Dosimeters are loaded in a TLD Holder, later some Straps are assigned to each TLD Holder containing the TLD Dosimeter. Each TLD Dosimeter has a unique Barcode assigned to them [4].
Mostly, the glow curve represent the results of measurement and reading of the TLD Dosimeter when the Harshaw TLD Readers are in used which serves as the basis for dosimetric applications and for practical dosimetry [5] (Figure 9 and Figure 10).
The dosimeter calibration reports are normally generated to give an idea on the Element Correction Coefficient and Temperature Time Profile [6].
Irradiation Value is the measurements, calculation and assessment of the absorbed dose and assigning those doses to individuals.
The irradiation time is the real time for monitoring dose to which the Dosimeters were exposed to radiation [7].
The calibration of TLD dosimeters with the Harshaw 6600 Plus help us to know whether the machine (Harshaw 6600 Plus) is working effectively.
Currently, the new model of the Harshaw 6600 Plus TLD Reader is capable of reading 200 TLD cards on the go or 800 TLD cards respectively.
Moreover, the Harshaw 2000 TLD Reader is another useful tool for research applications, monitoring whole body such as Hp 10 and Hp 0.07 respectively. The Harshaw 2000 Reader consists of two (2) robust pulse converters and a pulse converter for registering luminescence [8].
Furthermore, the Harshaw 4000 TLD reader is made up of a source.
The various Harshaw 6600 Plus TLD Readers which are used in Personal Monitoring service for all the Occupationally Exposed Workers serves as an integral component of the Institutional Radiation Safety Programs in Ghana [9].