Code of Massachusetts Regulations
105 CMR - DEPARTMENT OF PUBLIC HEALTH
Title 105 CMR 120.000 - The Control of Radiation
REPORTS
Section 120.641 - Performance Criteria for Sealed Sources

Universal Citation: 105 CMR 120.000 MA Code of Regs 120.641

Current through Register 1531, September 27, 2024

(A) Requirements for sealed sources installed after July 1, 1993:

(1) Must have been registered in accordance with 105 CMR 120.128(N);

(2) Must be doubly encapsulated;

(3) Must use radioactive material that is as nondispersible as practical and that is as insoluble as practical if the source is used in a wet-source-storage or wet-source-change irradiator;

(4) Must be encapsulated in a material resistant to general corrosion and to localized corrosion, such as 316L stainless steel or other material with equivalent resistance if the sources are for use in irradiator pools; and,

(5) In prototype testing of the sealed source, must have been leak tested and found leak-free after each of the tests described in 105 CMR 120.641(B) through (G).

(B) Temperature: The test source must be held at -40 E C for 20 minutes, 600 E C for one hour, and then be subjected to thermal shock test with a temperature drop from 600 E C to 20 E C within 15 seconds.

(C) Pressure: The test source must be twice subjected for at least five minutes to an external pressure (absolute) of two million newtons per square meter.

(D) Impact: A 2-kilogram steel weight, 2.5 centimeters in diameter, must be dropped from a height of one meter onto the test source.

(E) Vibration: The test source must be subjected three times for ten minutes each to vibrations sweeping from 25 hertz to 500 hertz with a peak amplitude of five times the acceleration of gravity. In addition, each test source must be vibrated for 30 minutes at each resonant frequency found.

(F) Puncture: A 50-gram weight and pin, 0.3-centimeter pin diameter, must be dropped from a height of one meter onto the test source.

(G) Bend: If the length of the source is more than 15 times larger than the minimum cross-sectional dimension, the test source must be subjected to a force of 2000 newtons at its center equidistant from two support cylinders, the distance between which is ten times the minimum cross-sectional dimension of the source.

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