[Code of Federal Regulations]
[Title 10, Volume 1]
[Revised as of January 1, 2001]
From the U.S. Government Printing Office via GPO Access
[CITE: 10CFR35.205]

[Page 569]
 
                            TITLE 10--ENERGY
 
                CHAPTER I--NUCLEAR REGULATORY COMMISSION
 
PART 35--MEDICAL USE OF BYPRODUCT MATERIAL--Table of Contents
 
                   Subpart E--Imaging and Localization
 
Sec. 35.205  Control of aerosols and gases.

    (a) A licensee that administers radioactive aerosols or gases shall 
do so in a room with a system that will keep airborne concentrations low 
enough so as not to exceed the limits prescribed by Secs. 20.1201 and 
20.1301 of this chapter. The system must either be directly vented to 
the atmosphere through an air exhaust or provide for collection and 
decay or disposal of the aerosol or gas in a shielded container.
    (b) A licensee shall administer radioactive gases only in rooms that 
are at negative pressure compared to surrounding rooms.
    (c) Before receiving, using, or storing a radioactive gas, the 
licensee shall calculate the amount of time needed after a spill to 
reduce the concentration in the room low enough so as not to exceed the 
limits prescribed by Sec. 20.1201 of this chapter. The calculation must 
be based on the highest activity of gas handled in a single container, 
the air volume of the room, and the measured available air exhaust rate.
    (d) A licensee shall make a record of the calculations required in 
paragraph (c) of this section that includes the assumptions, 
measurements, and calculations made and shall retain the record for the 
duration of use of the area. A licensee shall also post the calculated 
time and safety measures to be instituted in case of a spill at the area 
of use.
    (e) A licensee shall check the operation of reusable collection 
systems each month, and measure the ventilation rates available in areas 
of radioactive gas use each six months.

[51 FR 36951, Oct. 16, 1986, as amended at 53 FR 27667, July 22, 1988; 
59 FR 41643, Aug. 15, 1994]