Specifications are given in this standard for test categories,
\ntest irradiation ranges, and acceptable models with associated
\nlevels of performance. A test is conducted when dosimeters are sent
\nfrom the facility that normally processes or reads the dosimeters
\n(i.e., the "processor") to a testing organization that facilitates
\nthe irradiation of the dosimeters under controlled conditions
\nspecified in this standard. The dosimeters are returned to the
\nprocessor for evaluation. The results of dosimeter processing are
\nreturned to the testing laboratory for evaluation under the
\ncriteria given in this standard.<\/p>\n
The standard applies to dosimetry systems used to assess
\npersonal dose equivalent at a depth of 0.07 mm in ICRU tissue in
\nextremities, specifically, hands or feet and forearms or legs. As
\nsuch, the standard applies to the performance of dosimeters worn on
\nfingers and on wrists or ankles. Because the basis of the
\nperformance test is the personal dose equivalent at a depth of 0.07
\nmm, this standard does not apply to dosimeters used to assess the
\ndose to the lens of the eye or the personal dose equivalent to the
\nwhole body. As in the previous version of this standard, no
\nconsideration is given to administrative aspects of dosimetry
\nprograms such as adequacy of dosimeter identification, detailed
\nformats of reports, field calibrations, placement of dosimeters on
\nextremities, or the assessment of dose from the placement of
\nmultiple extremity dosimeters.<\/p>\n
The basis of absorbed dose and dose equivalent in this standard
\nis the personal dose equivalent at 0.07 mm specified in both the
\nInternational Commission of Radiological Protection (ICRP) and the
\nInternational Commission on Radiation Units and Measurements
\n(ICRU). Specifically, factors that convert air kerma in photon
\nfields to personal dose equivalent for rod and pillar phantoms are
\ngiven in ISO 4037-3 (ISO 1999).<\/p>\n
The standard applies to the evaluation of dosimetry performed
\nfor radiation protection under low-dose and high-dose conditions in
\nphoton and beta fields. The tests for accident dosimetry are
\napproximately represented by the high-dose category.<\/p>\n
As in the earlier standard, N13.32-1995 (ANSI\/HPS 1995), neutron
\nexposure of the extremities still presents a special problem. The
\ncommittee reviewed this issue and found no compelling evidence to
\nimplement a neutron dose equivalent test for extremity dosimeters
\nat this time. Quoting from the previous standard:<\/p>\n
Current neutron fluence-to-dose-equivalent conversion factors
\nspecified in recommendations of the NCRP are derived from the
\nmaximum value of dose equivalent in a 30-cm diameter cylindrical
\ntorso phantom. These values include secondary charged particles
\nfrom neutron interactions as well as contributions from gamma rays
\nfrom the absorption of neutrons by hydrogen atoms. The use of data
\n(including the quality factors) from the cylindrical torso phantom
\nmodel is not applicable for the extremities. Therefore, neutron
\ntest categories are not included in this standard. This issue
\nshould be reexamined in future revisions of this document or when
\nappropriate fluence-to-dose equivalent conversion factors are
\nestablished.<\/p>\n
A concerted effort has been made in this standard to segregate
\ntype-testing issues, typically performed once in the lifetime of a
\ndosimeter system, from periodic performance testing issues. As
\nsuch, there is no specific requirement to conduct a one-time
\nevaluation of dosimeter performance under conditions of
\nnonperpendicular angular incidence. Neither is there a requirement
\nto conduct a study to evaluate the lower limit of
\ndetectability.These tests are important in the interpretation of
\ndosimeter results but should be addressed in a type-testing
\nstandard.<\/p>\n
The methodology and criteria presented in this standard provide
\nthe basis for evaluating the performance of extremity dosimeter
\nsystems. Section 2 comprises a list of terms and definitions used
\nin the standard. Section 3 ANSI\/HPS N13.32-2008 2 comprises the
\ntesting procedures, testing categories, specifications of testing
\nfields, specification of testing phantoms, specification of
\nirradiation geometries, selection of irradiation levels, and the
\nassignment of shallow dose equivalent. Section 4 describes the
\ncriteria by which performance is judged to be acceptable.<\/p>\n
Following the example set in the standard for testing whole-body
\npersonnel dosimeter systems, N13.11-2001 (ANSI\/HPS 2001), ancillary
\ninformation to clarify and support the positions in this standard
\nis included in the appendices.<\/p>\n
The scope of this standard is sufficiently comprehensive that
\nsatisfactory performance implies that a dosimetry processor or
\nprovider is competent to assess personal extremity dose under a
\nbroad range of field conditions using the tested dosimetry
\nsystem.<\/p>\n
Purpose<\/strong><\/p>\n This standard establishes standardized testing conditions and Performance Testing of Extremity Dosimeters<\/b><\/p>\n
\ncriteria to evaluate the performance of personnel extremity
\ndosimetry services.<\/p>\n","protected":false},"excerpt":{"rendered":"\n\n
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