ESA Document - Emits - ESA
ESA Document - Emits - ESA ESA Document - Emits - ESA
s Acceleration, g 100.00 10.00 Limits on Linear Acceleration for Unconditioned, Properly Restrained Crew 1.00 0.00 2.00 4.00 6.00 8.00 10.00 12.00 Time of exposure (min) Figure 2-5: Requirements for sustained g-loads -Gz +/- Gy +Gz -Gx +Gx HMM Assessment Study Report: CDF-20(A) February 2004 page 26 of 422 The requirements on the impact g-loads (dynamic) depend again on the time of exposure to the impact. Figure 2-6 represents the tolerance to short duration –Gz accelerations (worst case). 2.2.4.3 Noise Figure 2-6: Tolerance to short-duration –Gz accelerations The requirements for noise levels were established to be the following: • Maximum noise exposure for 8 hours: 84dB (NASA-STD-3000) • Maximum noise exposure for impulse sound: 140dB (NASA-STD-3000) • Maximum ambient noise level during daytime: 60dB • Maximum ambient noise level during night time: 55dB
s 2.2.4.4 Temperature and relative humidity HMM Assessment Study Report: CDF-20(A) February 2004 page 27 of 422 The temperature and relative humidity requirements were determined in compliance with Figure 2-7. As a consequence, the temperature in the habitable environment shall be between 18 and 27 °C at all times, for all the habitable volumes (THM, SHM, MAV, ERC). 2.2.4.5 Radiation Figure 2-7: Temperature and Humidity levels The requirements for radiation doses depend on various factors such as the anatomical part exposed, age and gender of the astronauts. The limits taken as a reference for the different anatomical parts are listed in Table 2-1: Anatomical NCRP Report No. 98 (Sv) 1 year Location 30 day limit limit Eye 1.00 2.00 Skin 1.50 3.00 BFO 0.25 0.50 Table 2-1: Radiation dose limits (BFO: Blood Forming Organs) Figure 2-8 shows the maximum radiation dose levels allowable depending on the crew age and gender, for the BFO. The selection of the age of the astronauts plays a very important role in the dose tolerance and, therefore, in shielding mass. According to the calculations, no extra shielding is required for the case of a 55-year-old male while 13 g/cm 2 are required for a 25-year-old woman.
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s<br />
2.2.4.4 Temperature and relative humidity<br />
HMM<br />
Assessment Study<br />
Report: CDF-20(A)<br />
February 2004<br />
page 27 of 422<br />
The temperature and relative humidity requirements were determined in compliance with Figure<br />
2-7. As a consequence, the temperature in the habitable environment shall be between 18 and 27<br />
°C at all times, for all the habitable volumes (THM, SHM, MAV, ERC).<br />
2.2.4.5 Radiation<br />
Figure 2-7: Temperature and Humidity levels<br />
The requirements for radiation doses depend on various factors such as the anatomical part<br />
exposed, age and gender of the astronauts. The limits taken as a reference for the different<br />
anatomical parts are listed in Table 2-1:<br />
Anatomical<br />
NCRP Report No. 98<br />
(Sv)<br />
1 year<br />
Location<br />
30 day limit limit<br />
Eye 1.00 2.00<br />
Skin 1.50 3.00<br />
BFO 0.25 0.50<br />
Table 2-1: Radiation dose limits (BFO: Blood Forming Organs)<br />
Figure 2-8 shows the maximum radiation dose levels allowable depending on the crew age and<br />
gender, for the BFO. The selection of the age of the astronauts plays a very important role in the<br />
dose tolerance and, therefore, in shielding mass. According to the calculations, no extra shielding<br />
is required for the case of a 55-year-old male while 13 g/cm 2 are required for a 25-year-old<br />
woman.
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